Have you changed the the spark plug wires?...Possibly the coil wire is going bad...they usually go first from what I've read. Still could be the IAM...they can exhibit funky behavior that is not consistant.
The other day mine started surging...bouncing from 500-1800 rpm...I pulled into a parking lot and popped the hood...started looking for something amis...I pilled the plug on the IACV and it made no difference (BTW this is a NEW IACV...but not genuine), next I unplugged the Throttle Position Sensor (TPS)...this made the engine jump up to a somewhat steady 1500 rpms...hmmm. Jumped back behind the wheel...check engine light on due to my fiddling with stuff...so I turn it off and unhook the NEG battery post to reset the ECU...wait 30 sec or so hook it back up and viola...everything's working great. What was the problem??...not a clue...but I suspect TPS is dirty...and I think the IAM is going.
I would make sure all electrical connections are tight and uncorroded. Make sure all your plug wires are on tight...etc...blah, blah, blah.
__________________
...But we in it shall be rememberèd;
We few, we happy few, we band of brothers;
For he to-day that sheds his blood with me
Shall be my brother...
1994 RRC LWB, 82k miles, 4.2, Cornish Cream/Lightstone Interior, spring converted.
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