Had the exhaust done and I've been driving it around, it's pretty nice pushing down on the throttle and actually getting a response. It drives pretty good, I just have one little problem so far. When I let off the throttle, like when I come up to a stop sign, the engine wants to die. It seems worse when it warms up all the way, I can also get it to sputter and stumble in the driveway in park sometimes when I let off the throttle. But when in gear and the engine warmed up all the way, every time I let off the throttle it wants to die.
Troubleshooting thus far:
-Triple checked fuel pressure, solid 14 PSI even when stumbling.
-Checked timing, dead on.
-Tested MAP sensor, tests ok.
-Replaced idle air control valve, the old one had a lot of play in it.
-Tested O2 sensor, tests ok.
-Disconnected EGR vacuum line, plugged it, and drove it. No change, still wants to die when I let off the throttle.
I'm trying to think what would cause this and right now, I'm stumped, any thoughts would be greatly appreciated! It's a 1991 Chevy 5.7 TBI, all smog components in place, 700R4 trans. Thanks and here's some more pics.
