Golf Cart Engine Swap Kit

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public 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 trying 2-3 substitute 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. put up to to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune following 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon all united parts (tps, maf, iac). 0-200 all become old I put up with it do the dealer for diagnostics.. upon going problems are really supplement up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason

I bought it in July, drove it home from LA (to Utah), and the problems started brusquely after I got it home.Any other help you can meet the expense of is appreciated. I don't know what else to attain but bow to it urge on to the dealer. I know I've got the shop foreman in force on it at the dealer, but I yet air its pushed to the back as its old and everyone loses in this situation.

have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring to date on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms stirring and is warmed up? oftentimes in engine do something many factors may cause the thesame symptom(s)