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Eng miss with a stabilitrac notice and cel for eng miss #5 cyl


Harley boy

Question

I'm Not a GM tech, but was 20 years ago

I found this problem,when my cel came on,I checked and found a code for eng miss for #5 cyl.

I performed a tune up,it has 76000 miles. Plugs and wires

It was fine for about 20 miles, than cel came on and stabilitrac notice for service came on.

This happens only at idle or at a stop,in gear. Once the cel comes on it stays on!

It does have a slight instability occasionally,that triggers the cel.

I have a friend at a Chevy dealership who told me about a service bulletin about the tps,Replaced. Lite went out , than it came back,now it had a code for #5 injector,tried cleaning,failed. Replaced injector lite went out, than came back cel is for eng miss #5 cyl. I checked coil it's fine, it uses 1 qt of oil in 5 k I use only Mobil 1 full synthetic 5-30

Plug is Not fauling.these issues started within the last 10 k .running out of patience. but I love this truck, any help would be appreciated.

Thanks

Rob

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