I have a 1986 IROC-Z with a transplanted TPI 1989 L98. The person I bought it from has put in SVO 24lb/hr injectors and a Crane Compucam (438 / 452 @ .050 112 LSA). The car has always had a slight 'hesitation' and the occasional stall, and the owner tells me it's because of the larger injectors and the fact it's still running on stock programming.

Anyway, recently the car has gotten progressively worse. Now, the car is difficult to keep running, and like to run < 1000RPM standing still in drive. While cruising, sometimes you can feel hesitation, too. I have to hold my foot on the brake and slightly give it gas to keep it from stalling. Generally, when started up in the morning it idles fine for about 10 minutes or so, that's when the problems start.

Any ideas? I'm not getting any SES lights, either.

 

make sure the tune up is good, and there's a very good chance you need a new prom to tune the transplanted engine for best preformance.

 

Hrm, after some more reading.. I think I'm going to start with the IAC first. Gonna yank it when I get home and clean the **** outta it.

 

Ok, pulled the TB earlier. IAC was gunked to all hell, lol. I went through a complete can of CRC Intake Cleaner on the IAC and TB. No more gunk. The TB shines up pretty nice, actually. It'll go back in tomorrow. *crosses fingers*