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Help me diagnose this problem pls

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ModInProgress

20+ Year Contributor
57
0
Oct 22, 2002
I am sure you have all seen this discussed or had this happen, but reading everyone elses threads just isnt cutting it for me, so heres another one. 91 gst, 130000 miles, runs great, or did but then i let it sit for about a week and now it wont run after 4g and full boost. changed the plugs and wires, and my vac is at 19 and always has been, which is great. I have read that this may be caused by a boost leak, i was running 17-18 pounds before when it was running awesome, now im down to 14 and it didnt fix anything but thats the lowest i can go with the boost controller hooked up..the car is stock minus intake, no cat, mbc and gauge. Some of things i can tell you that i noticed with the car now is this, if i go wop in first, second and sometimes in 3rd at about 3800rpms and just about full boost i see the boost drop a pund or 2 and then just completely go to 0 and the car falls on its face. it has a new fuel filter, i never had fuel trouble before unless i got up around 20 psi, i know 17 18 is pushin it but its just my fun car and if it breaks that will force me to build it right i guess, but anyway it was workin and still does but not right. I i checked alot of my intake lines and shit and they are all tight, no missfires, no cel, and the car will go over 4000 if i do it at like half throttle. the last tank of gasi had before i didnt drive it for a while was 100 oct. i put like 3 gallons in when iwas on e just to see if it ran alot faster at like 19 psi and it didnt so i kept it at 17-18. and it ran great until i started it up a week or so later, so now it has 93 like usuall and thats my problem, hopefully i mentioned all you guys need to know to give me some feedback, i really dont want to pay someone at a performance shop to tell me that i have a bad 02 or injector when i cna do it with you guys helpin me on here for free, thanks for reading, sorry its so long. Lata Jason
 
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