problem with my car??

[WrXeater]

can someone PLEEEEEEASE help me figure out whats wrong with my car..its getting worse and worse and its pissing me off!...my mods are just an intake filter, cat-delete downpipe (that i believe blew out my 2nd O2 sensor) 1g bov, ngk plugs, ported 14b (no shaft play) and 2.5 inch exhaust.

now just before my 14b install my car started to have (what i thought) to be missfiring problems after i installed my downpipe.it felt like dumping the clutch real hard.only i was already at freeway speeds..and it would only happen seldomly..i installed a boost guage and the thing that tripped me out was i was spiking to 20psi on my stock T25 and bcs restrictor..so i get a boost controller and turn it down to 13..but the problem continues and everytime it (missfires i guess) my check engine light would come on...so i tried disconnecting my O2 sensor...car seemed to be fixed for the first 10 minutes..then it jerked again and the check engine light came back on.

i figure maybe my spark is bad.so i switch out my plugs to some ngk's but its still doing this jerking thing but it only seemed to do it in 3rd or above when i was getting on it. (sidenote it would do it more frequent at higher speed (80 and above).

 

[WrXeater]

>>>continued..sorry guys i know its long but i dont know how else to explain it.

So anyways.i thought my T25 was simply seeing its last day and with that i upgraded to a 14b...using my own fabricated licp and some crappy home depot couplers. once i first got it on i set the boost as low as possible (which was about 9 psi) but the turbo would just jump to 10 and then creep to 15...then one time in a 2nd gear pull i really got on it and it creeped to 20psi..not only did it pull hard as hell but it freaked me out that even though i was on stock fuel i didnt hit fuel cut. and i noticed right after that i could only hit 10 psi and the turbo sounded way too loud..so i figure a boost leak....but i notice as my speeds get up it starts doing that jerking thing more than ever and the car is reeeally slow....turbo only hits 10 psi and it feels like 2...now at anything over 80 the jerking and (missfiring?) is practically continuous and im very dissapointed..if there is anyone from san diego on here that would be willing to help me figure out the problem i would be very much obliged..thankyou

 

[WrXeater]

nvm..found he problem(s)..boost leak, bad spark plug wires, bad terminal connections are bad, need a new 2nd O2 sensor

 

[oddrob]

Eliminating the cat exasperates the boost creep issues as well.

 

[91-gsx]

a lot of what you are saying happened to my 1g when the capacitors on the ecu went bad. basically at high rpms, above 4000-5500, the car would not want to accelerate and felt like it was missfiring. I'm not sure if 2g's have the ecu problem, but they might, its worth taking it out and checking it before you pay more money.
later

 

[larsrya8]

a lot of what you are saying happened to my 1g when the capacitors on the ecu went bad. basically at high rpms, above 4000-5500, the car would not want to accelerate and felt like it was missfiring. I'm not sure if 2g's have the ecu problem, but they might, its worth taking it out and checking it before you pay more money.
later

The 2G ECUs do not have the same capacitor problem that the 1G ECUs have... or at least that is what I've heard.

Besides, he said he found the problem. Don't you have a bad O2 sensor 91-gsx?

 

[WrXeater]

nvm its doing it again. other problems at lower gears are fixed but the high end is still shady.my car seems to hate anything above 90mph..once i get near that area.any sort of throttle input and it feels like its missfiring or skipping (dumping the clutch) over and over.....has anyone gone through this..i mean this happening especially at higher speed?

p.s my old trany blew out about 4 months ago. since then i repaced it with a used one with only about 45-50k miles on it and replaced the clutch with an act 2100, so i dont believe it has anything to do with the tranny or clutch because otherwise the car drives fine

 

[blackGSX2g]

What was the CEL for?

The rear o2 is only to check the operation of the catalytic converter, it doesn't affect drivability.