Ok, 91 astro AWD... I've changed every sensor except the TPS and the main computer and it still idles rough (rough enough it shakes your brain while your sitting at a light). It will occasionally stall but only going into reverse.
Above idle it still runs great and pulls hard with no oil burn or black smoke.
I also changed the injectors, map sensor, knock sensor, coolant sensors, egr solenoid, cleaned the egr itself (wasn't really dirty).
The van only has 250,000 kms on it so this is really tickin me off.
Put a new wire set, new plugs, new cap & rotor, checked the timing, replaced all the vac lines.
Not sure if it's related but the cruis control doesn't work either but has great vacuum going to it.
I was gonna do a V8 swap but I can't get the mounts for a reasonable price or find a good set of plans.
This is our daily driver and hauls our 4 kids around so if anyone has any ideas please let me know.