87' 22RE Horrible idle surge, throttle useless.

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I brought my truck into a mechanic with what i assumed was a bad TPS. I had no power above 3K RPM, I did a sweep-test with my OHM Meter and found the TPS had a deadspot. Not having any luck finding a new TPS down here in Costa Rica I figured the mechanic would have better resources.

When I brought the truck in it was still drivable. The mechanic putzed around with my truck for 2 weeks until I finally got fed up, headed down there and limped it out of his shop with the same busted TPS, but now in much worse condition than when I dropped it off.

Now its idle is all screwed up, It sweeps from 7K to 2K over and over and over. Messing with the throttle does nothing, I cant rev it, cant do anything. When I remove the TPS cable from the TPS it goes ape and redlines.

I can limp it around with the tach sweeping from 7K to 2K, bucking and chucking the whole drive.

I adjusted the TPS but that made no change, I assume the TPS is pretty much dead now but there must be some other issue at this point.

I found a crack in the air intake hose to the TB and fixed it up with some ducttape. Made no change. Checked for vacuum leaks but found none. I am wondering if maybe he hooked up some vac lines wrong. Need to check them all again.

Any ideas? Here is a video.

22RE IDLE SURGE TPS - YouTube

 

[KLF]

A bad TPS won't have that much effect. You can actually unplug the TPS and the truck will still run, just not well.

Have you checked the ECU for any codes?

Do you have a FSM where you can start checking vacuum lines? Sounds like a massive vacuum leak somewhere.

Also, check the cam timing, make sure the chain hasn't jumped a tooth or something. Then check the distrubutor, make sure it's still correctly timed.

 

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turned out to be a bent line in the fuel pump, had to drop the tank to find out. not sure how that happened...