I have a 1993 s10 4.3 4x4 and I can start it up just fine and it’ll run for about 5-10 minutes then it starts to idle really high and about 10 seconds later it shuts off and won’t crank back up unless I give it about 20-30 minutes to cool down. Doesn’t run hot all gauges look fine. Has brand new...

Alrighr, so i know the 4.3 isnt worth building or putting power behind, but how can i put a new tune on the ecu. I got an exhaust done because i think the motor sounds great, qnd somewhat expected it's runs stupid rich. Like i spit fuel out the exhaust rich. I know i could do the whole eprom...

4.3 TBI has always taken 2-3 turns before it fires up. Last week, after firing up, the idle went up till I thought the engine was going to come out of the bay. Power is non existent until after thirty minutes of warming up, and even then, under load it bucks and what sounds like cuts off and...