Miss at 4000+ RPM ECM code 43

[PJS2k2]

My daughter's (new) 1991 Cutlass (3.1 L engine) runs fine at idle and low speed, but has a very bad miss over 4000 RPM. The Service engine light stays on, and a check of the codes reveals "43 (elec. spark control) People I got the car from just had a few ignition modules replaced, O2 sensors, plugs and wires by their mechanic- problem still occurs.
I replaced Catalytic converter (was plugged) / New plugs and new wires installed (found one of the mechanic's specials completely broken off in back of engine) The car still runs bad! PLEASE HELP!!!!!!!

[PJS2k2]

After extensive research, the problem turned out to be a shorted Knock Sensor. The short occured after heating up, and would advance timing 15Deg. and car would miss.

[pcv]

Thanks for the info. Glad it was that and not an ecm.

[89calais]

Could the 89 2.3 QUAD 4 GM motor have the same results ( If having a knock sensor) , I did notice a long while back , Just as my water pump went out in my Calais , It would act really weird in the 4k-5k range. I was at the time street racing it , Had a few modifications put in it and then one day just acted weird right at 4k , Like skipped fire or bogged out , Dunno but lost at least half of the bhp and the torque decreased dramatically and acceleration was at like 5% of normal. Any suggestions ? Could be something to do with a loose timing chain to ( so i've heard. ) we'll see after I get mine retimed.

[amberj]

does any one know how to take a module out of a 1987 cutlas ciera gt