Matatk wrote:
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screamin_conure wrote:
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josephf31 wrote:
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Matatk wrote:
Is the car running in closed loop? Do you have headers?

No headers, stock manifolds. Pretty sure it's not in loop how can I tell for sure?

The only way to tell if you're going into closed loop is with an OBD1 scan tool. Something like this: http://www.autoxray.com/product_detail.php?pid=94.

Prices for these can vary, and you can find good deals for used ones on eBay. If you do pick one up, since your car is a '91, make sure that it is for OBD1, and that it can read live ECM data.

Otherwise, just about every well equipped repair shop / mechanic will have a scope or scan tool that can tell what's going on with your system as well.

Ron

You can use a paperclip and observe the check engine light on the dash. Instructions are here:

http://forums.corvetteforum.com/c4-te ... cation-91-5-7l-vette.html

It also references the IAT causing running problems. I recommend getting the car scanned with a tech 1, laptop with tuning software, or equivalent scanner so you can see what your sensors are doing.