Wiring Diagram For 2002 Grand Caravan

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to drive off a cliff. had a idle surge burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After irritating 2-3 swap used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. still had issues. back to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble once this car.. bought a used one.. more trouble. had the indigenous one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS compulsion to be re-adjusted? The master tech did all sorts of diagnostics on all associated parts (tps, maf, iac). $100-200 every era I receive it accomplish the dealer for diagnostics.. upon going problems are essentially surcharge up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason

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I started the car taking place this morning, it starts going on and runs at 1750 and within a minute or hence climbs over 2500.. It is meting out smooth though, just pretentiousness far along than it should be. I moreover checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and every contacts verified. I character fine not quite them as I've been in there a bunch of times..

once I begin the car, the engine surges occurring between 1200 and 2000 rpm back and forth. I tainted the IAC and the TPS gone no correct in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to accustom yourself the idle quickness screw to degrade the rpm and it would retain for a while. Now, the engine is all the time surging to the dwindling where I cannot steer it for dread of damage to the steer train. Any experienced solution?

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