That'* not valid then. All you know is when it heats up, that one cylinder isn't firing. My advice above is still the way to go.

Pull all 6 plugs, keep them in order. You're looking for a pair of fouled plugs common to one coil, or maybe even 4 plugs common to two.

Well before jumping all over the rich thing, check the o2 crosscounts. The engine will bounce from rich to lean over and over, which is normal. Your o2 mv is high, but that'll bounce around quite a bit too.

Other than that, Bills got you goin in the right direction.

thanks a lot dr jay and willwren i will try that tomorrow

well today off i go to check plugs wires and coils be back later today

I had that same problem after I changed the ignition module. It was my aftermarket ignition module I bought auto zone. put a gm one in there and no problems since.

Thats what I was thinking the ICM or the connector electrical fault.
If after you check the spark thing and they all don't spark check for injector pulse also.
If no pulse you could have an intermitten fault in the ICM or connector.
Sometimes a loose pin on the socket connector will loose connection when hot.
Tighten up on all the ICM plug connector sockets.
Is this an aftermarket ICM or Delco?

I think we need to read the plugs first, guys. The plugs will tell you what'* happening, and where to look. If he finds all 6 fouled, then we'll look at the ICM. If not, then it'* probably a coil or wire.

could it possibly be loose/bad MAF wires? He did say the intake fell off at one point.

The MAF cannot cause loss of spark.

Like I said "if after".