1999 F350 Engine Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 every second 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 period he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune considering this car.. bought a used one.. more trouble. had the native 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 upon all connected parts (tps, maf, iac). $100-200 all epoch I take it attain the dealer for diagnostics.. upon going problems are in point of fact calculation up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Its as well as worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will all repercussion in insufficient fuel living thing delivered to the engine. Might as well as be worth cleaning out the idle promptness rule motor / valve as these get clogged happening afterward carbon and some brake cleaner washed through helps release things off.

taking into consideration I begin the car, the engine surges up amongst 1200 and 2000 rpm back and forth. I tainted the IAC and the TPS with no fine-tune in symptoms. I have noticed that several Lexus SC’s have this thesame issue. Prior to this I would have to get used to the idle promptness screw to humiliate the rpm and it would sustain for a while. Now, the engine is for ever and a day surging to the narrowing where I cannot drive it for terrify of broken to the steer train. Any experienced solution?

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