Hey,

Greetings from Fort Collins. I'm new to this board and look forward to some good advice!

Anyway, I've got an 88 4runner, 22re, MT that's having some idle issues. It seems to idle really low, and the idle is unsteady. Generally pulling up to a light it will be real low, and then slowly, over like 10-15 seconds it will increase. Sometimes it will get to a high point and then suddenly drop back down, like the ECU is cutting fuel or something. It doesn't matter if my foot is on the brake or not.

Truck runs pretty well off idle. Good throttle response and decent mileage (22 highway) It will surge a little if I hold the accelerator steady in second or third gear.

Here's what I've done so far:

-Adjusted TPS to specs
-Thoroughly cleaned out TB
-New plug wires
-Pulled plug wires at distributor - plug number one caused no change. Put a new spark plug in #1, this smoothed the idle and raised it a bit, but still idles rough. Now if I pull 1,2, or 4 while running the idle will drop a little, but if I pull #3 it will drop a lot (!)
-Applied vacuum to EGR at idle and truck almost dies
-Pulled vac hose to fuel pressure regulator - no change. Apply direct intake vacuum to this - no change.....could be bad??
-checked out coolant temp sender - within specs
-Diagnostic short doesn't change idle speed

I plan to: get OEM cap/rotor/plugs/wires when I get paid, valve clearance check, replace all vac hoses

I have a feeling there are a few things going on here. i.e. new #1 plug helped but didn't cure it... Perhaps since pulling #3 causes such a drastic change I have a bad cap/rotor?

Anymore stuff I should be looking at?


Thanks!
-andy