87 buick lesabre eng miss


#1

new coils, ingination module wire , plugs, did compression test all sixx good avg. ragne between 135-160 miss is at all time any speed not just at idle


#2

Bad fuel injector, or intake manifold gasket leak. Spray carburetor cleaner all around the intake manifold gasket to see if it changes anything.


#3

My opinion would be to connect a vacuum gauge to the intake and see what’s going on.

Sorry, but 160 PSI is a bit weak, but tolerable.
135 PSI bites. Not only is that low, but you have a 25 PSI variance here and that is not good; especially on a 3.8.