I have a superchip street version. from www.superchip.com... I bought it new off ebay. I had installed it and ran great for two weeks.. all of sudden I had a problem with looping idle.. check for air leaks replaced all the vaccum lines and still had the problem.. I reinstall my stock chip and the truck runs great.. left it that way for a week to make sure.. put the superchip back in and start it up and right away the looping was there. I call superchip and they had me send the chip to them.. they shipped me a brand new updated one.. I install it and still having similar problems. now what happens is when I first start the truck (cold engine) it idles like crap and if I throw it in gear to quick it will stall. If I start it and then give it a quick shot of gas it seems ok or if I let it run for 5 minutes it's also ok afterwards. tonight I go out (it's 32 degrees celcius outside) start it up for the first time in 2 days .. runs for about 10 seconds up and down and stalls.. start it up again and it's ok. If I put the stock chip in I don't have any problems at all. I 'm running 92 octaine with this chip and the performance is great..

anyone have any ideas?? my buddy is suppose to lend me a map sensor and an esc module to try.. thing is if it runs fine with the stock chip could there still be something wrong with a sensor??? I never get any codes or anything...

thks

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'88 C1500 350 TBI
Belltech 2/4 Drop,
Nitro Drop Shocks,
3.73 Rear gear ratio,
Edelbrock performer TBI intake, performer cam, timing chain,
Hiflow cat with Rhino dual 2 1/2" out the rear.

 

I think you answered your own question, if the stock chip doesnt do it, theres something wrong with the aftermarket one. No real surprise there.