A.P. ... 8/20/2016
1999 Cadillac Escalade Base 8 Cyl 5.70L
At tick over I have a surging problem.
I bought this Cadillac with cracked heads. I have replaced the heads and have the engine running and starting perfectly. I replaced the distributor cap, rotor, wires and plugs. Runs well with alot of power when revved up. When idling (ticking over) the engine surges. I had it checked on a computer and it says that there are no faults. Any guidance would be appreciated.
Several possibilities; engine vacuum leak, fuel supply pressure is low, air intake filter is clogged, dirty mass air flow (MAF) sensor.