2.0L sunbird motor miss fire HELP

[Rick]

Does anyone here have a 1990 sunbird more so the TBI version of this motor that misses. Mine does and I'm very sure that it's related to the ignition. I hear that most of these motors miss. I have changed the ign module in the distributor, coil, wires, plugs, cap and rotor. It still misses. I have done a compression test and they are all around 200 psi so that can't be it. Can someone help please.

 

[uconn1150]

Timing? TB leaking?

 

[sbc350gearhead]

Check for a vacuum leak.

 

[Rick]

There is a gasket that sits between the Tb and the manifold, now can that go bad over time and cause missfire?
It does seem wet looking on that gasket.

 

[Drew99GT]

It's not unheard of. Get a vacuum gauge and go through the diagnosis that's stated in a repair manual; that will help you determine if you have vacuum leaks or other weak parts in the engine like valve springs etc. that would cause a miss at idle.