2.2L - 2nd gen 4-banging
1997 Chevy S10 2wd 2.2l
Recent head gasket job.
1. Runs rich at idle
Eventually throws rich code (p0172)
Idle fluctuates when warm, mainly when coming to a stop.
Drops down to about 400 rpm, lights dim, engine almost stalls then revs back up to about 1200rpm then...