You could have a bad injector, ohm the resistance of each one. they should all match. I am thinking maybe 14 ohms but could be wrong, check specs for your car. you need to at least narrow down which cylinder then check for spark on that cylinder while the miss is happening. some of these 3.8 engines would melt the plastic intake manifold at the egr passage and leak coolant into the cylinders, are you losing coolant?
SOURCE: location of cam positioning sensor for 1991 chev lumina 3.1
On your 1992 Chevrolet Lumina-Sedan/Coupe 3.1L MFI OHV , the Crankshaft Position Sensor is located:
Under hood, passenger side, lower engine area, passenger side of engine block, mounted front of crankshaft pulley
SOURCE: crank no start 94 chev lumina
Hmm, been a while since I played with one of them, but I do recall a simular problem. Try this,,, locate your ECM that you replaced,find the orange wire, and trace it back. I have found breaks in this wire in different places, mostly in the harness running under the rad support. The orange wire is a power wire for the ECM.
SOURCE: when attempting to touch gas it dies, will idle in
sounds like it is starving for fuel. check fuel filter to see if it is clogged. also make sure fuel pump pressure is ok.
SOURCE: how do you change a speedomotor cable on a 1991
This vehicle does not have a cable.It has a vehicle speed sensor.It is on the transmission on the passengers side axle by the tail shaft.If you know some one with a scan tool then you can see if you are getting a signal.If you are then it could be the instrument cluster.Which is the speedometer itself.Hope this helps.
Under hood, passenger side, lower engine area, passenger side of engine block, mounted front of crankshaft pulley
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