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Can you tell me what your working on please?Need the year, make and model as well as engine size.
Okay thank you for that , when you say you have a high ladle do you mean high idle?What sensors have been changed as well?
Have they verified that the throttle plate is closing completely?
If you take a shop rag and place it over the throttle body dose the engine stall or stay running?
Please do, you want to try and choke it off when you do this.
If you choke all the incoming air off with the shop rag the engine should die completely and if it dose not then it sucking air from someplace else.
Well with the engine running the only place air can enter the engine is through the throttle body and when you choke that air off the engine should die with not air flow. If its staying running then its sucking air and that is usually Heather a leaking intake or the throttle body base jacket or a leaking vacuum supply line.
Please do because the engine is getting air from someplace beside the throttle body if it will run with the throttle choked off.