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Re: temperature of catalytic converter
If coolant is low, that would cause an initial rough idle on startup, if coolant is pooling into cylinders overnight(possible upper plenum problem at EGR opening in upper plenum)......
50K last tuneup? That could mean you need another one......take the wires off the coil terminals, one at a time, and look for arcing/corrosion on the coil terminals....that will cause a misfire.....carbon tracking on the insulators of plugs is common....if that is the problem, wires AND plugs should be replaced.....
A secondary misfire can usually be found by this......drive the vehicle on a highway at 55-60 mph....should be no misfire while cruising.....now find an area where this is a slight upgrade, and lightly accelerate(don't want to accel hard and make it downshift......we want to stay in fourth and keep that TCC engaged)....if it starts to buck, that is usually a sign of secondary misfire, usually wires, plugs, coils, or some combination of all three....
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