Added a 15ms pause at end of connect macro (following a post by @RobertISaar) in @JeepsAndGuns $8D-1227730-V1.1.adx. Somewhat encouraging as it now connects but immediately reports data errors and...

Laptop & cable connect fine to my 91 GMC truck with appropriate bin & adx, but hangs at DA Connecting on my 91 firebird using "AWFU 91 F-car 5.0 TPI 700r4.bin" & trying both "$8D-1227730-V1.1.adx"...

Closing this out so maybe helps the next person. It was a weak spring in the EGR valve so that it opened too much/soon. The way the GM manual tests are written it still passed all tests. Replaced...

Testing EGR & solenoid with vacuum gage & pump and they both seem to check-out. However, if I leave the egr valve vacuum line disconnected, it runs better, and it seems like the big jump in map at...

Maybe this is a big hint to someone - Runs really bad at transition from stopped at idle to traveling down the road. Closely monitoring Map kPA and TPS, I see that Map kPA jumps up dramatically as...

I used a hand vacuum pump to test. Diaphragm moves and vacuum holds. Is the ecm signal that opens the solenoid available in tunerproRT $42-1227747-V5.2.adx?

Sent to Witch Hunter for clean & test. Still runs the same. Anymore ideas?

I am surprised at how little correspondence there is between TPS voltage and MAP. In other words at small amounts of throttle MAP might be anywhere from 30 to 80. Seems like a high map at low...

1. Coolant temp is a little low - running 185-190 F. Is that low enough to switch to a higher rate fueling table? How would I look that up? TPS & MAP look good.
2. Tried test run with O2...

Previously found the air cleaner thermal flap not opening when warm. I just have it blocked open. Are parts available to fix? Did a quick search, but couldn't find anything.

1991 GMC k2500 pickup 350 TBI all stock. 236,000 miles. Most blm's head down to 108, but tailpipe doesn't look or smell rich. Runs good only at map's above about 80 - highway uphill for example....

Long time lurker & tunerprort user. 1993 Chevy k2500 454 Suburban. 1991 GMC k2500 350 pickup, 1991 Pontiac Firebird formula 305