start the car in the morning runs great -every morning- drive to work park it and come back has serious misfire - not back fire- runs ok has no codes. replaced ignition spark control modal, cap, rotor, and wires. looked at spark plugs all look fine and the same, dont smell anything like fuel or oil burning.
86 2.8 firebird bored out to 3.4 mpfi stock ecm except of EGR a while ago cleaned MAF with spray

 

You can try to isolate to the effected cylinder by pulling the plug wires with spark plug wire pliers .
or use a inferred gun and point at exhaust manifold ports. Could be a bad injector.

 

did the infrared thing found on cool but not sure why "start up" it's fine any ideas

 

Might want to get warm and pull the plenum and ohm injectors.

 

yea I was hoping for push this button and all is better LOL

thx

 

different question I have uprated injectors 17 lbs i actally want to replace them with something - rebuilt- better and have read several different opinions about end types

 

Might ask southbay fuel injectors opinion. Rebuilt older bosch might be a good injector.
but being a larger cid might want to datalog and tune or see if there is a afpr available.
iirc 3.1l is the same fpr as tpi but not sure if anything other than modify to external pressure regulator.