random miss and stutter in boost with erratic idle surging ?

[v8killer]

well about a week ago i had this stutter when i would get to about 5000rpm into boost, so i replaced the coil and it went away. well yesterday i decide to play with the tune in tunerpro and retard my cams 2 deg, well after swapping the tune and retarding the cams i went to drive my car and as soon as boost got to like 5 lbs the car felt like it was running on 3 cyl's . i come back and let the car idle next thing i know its idling high and trying to surge and had a hesitation when i revved it. fuel pressure looks good all the pipes look to be intact.I'm at a loss ! this morning on my way to work the only way i could tell anything was wrong was when i got into boost other than that it ran good. an di also think it has something to do when the car gets up to temp !

 

[Dsmj89]

Start with the basics, get the car back to oem settings.
Check your spark plugs to see if they are fouled out. Also check your spark plug wires.
I had a problem once with my previous gst, i took the car down the block and it pulled fine, took it back down the block and it performed ok until i went past 4k that it would sputter. Turned out to be the cables..
As for the temps going up, make sure your t-stat isn't stuck closed.

 

[v8killer]

plugs look good but i have a backup set i can try, also i'll have wires tomorrow to put on it ! i don't understand why it was idling high and trying to surge. i will try a stock tune with just injector compensation.

 

[Dsmj89]

Make sure your throttle cable and/or throttle body aren't getting stuck open either.
Clean your throttle body out with some carb cleaner too while you're at it.

 

[pandabeartsi]

Have yu taken the honey combs out of your maf? I had this same problem when I swtched to a 2g maf.. When I would get on it it would hesitate really bad like somethibg was holding it back and it sounded like the car was back firing

 

[v8killer]

its clean and not sticking, i
m not a noob, this is just a problem that i need a few more brains on !

 

[v8killer]

Have yu taken the honey combs out of your maf? I had this same problem when I swtched to a 2g maf.. When I would get on it it would hesitate really bad like somethibg was holding it back and it sounded like the car was back firing

honey comb in tact but i did play with the little screw in the bottom of the mas before driving it ? i forgot about that.... but i did put it back and no change.

 

[TRBOBLU]

Put a boost leak tester on it. Looking at the pipes alone is not a good enough test. A boost leak will cause high idle/surge and will make your car run like crap under boost if it is big enough.

 

[pandabeartsi]

honey comb in tact but i did play with the little screw in the bottom of the mas before driving it ? i forgot about that.... but i did put it back and no change.

hmm thats wierd..whenn i first switched the the 2g i wired it wrong and it actually blew the maf. so i went though a bout 3 mafs till i got a unhacked one that wasnt blown!

 

[v8killer]

Put a boost leak tester on it. Looking at the pipes alone is not a good enough test. A boost leak will cause high idle/surge and will make your car run like crap under boost if it is big enough.

well i done one last week but that doesn't mean i didn't blow a gasket or spring another leak, i'll try to do one when i get home and i'll let you guys know the results.

 

[v8killer]

guys could a bad knock sensor cause this ? i have been having weird timing pull through my runs and i know its not detonation because of a very mild tune @ 14psi so i have one ordered at advance but wont be here till the 20th !