My 2000 Sable has an idle problem.
Sitting in park the idle drops and jumps over and over until the engine stalls. In drive, sitting at a red light, the idle hiccups every 20 seconds or so.
Three years ago I put in a rebuilt crate motor, a new ECM, idle control valve, MAF, O2's, EGR, plugs, wires. The stumble was always there in park even after replacing all the above, but lately its gotten worse to the point that it now stumbles in drive.
Any suggestions what to look at?
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