2001 GMC Safari Idle

Bare with me, I do not know anything about cars and am at the mercy of mechanics - my story, vehicle broke down on highway - I heard a big clunk in the middle of
the van and then it seemed like no gas to vehicle - had power but it died, had it towed to mechanics and had the fuel pump replaced on my 2001 GMC Safari $550, after I picked up the vehicle that day it was idling high, I basically sit and steer and do not need to touch the gas pedal the vehicle builds speed upto 50/60 kilometers/hour.
The vehicle had a recall so I brought it to the the GM dealer for the recall work two days after fuel pump was installed and asked them to look at the idle while they were doing the recall - they asked if work had been done recently as the there was a problem with the throttle screw order notes states: Scan Data - output test 1AC idle spped, IAC O.K., DATA IAC Counts 0 TPS VOLTS .78, High, throttle stop screw adjusted too high, screw is seized, will not adjust. dealer advised screw would definately break it he tried to adjust and I would be looking at more $$$ and to bring it back to mechanic.
so I brought back to mechanic the next day and asked he correct work he had done and not to do any other work...he called later that day and advised dealer wrong, it was a sensor and not throttle stop screw as they are not adjustable and come from the factory like that -they are not adjustable he has given me a new bill $266. $170 labour $62 parts his computer scan indicates idle too high, coolant temp sensor registere -40 degrees F when engine at 190 degrees F operating temp. replace defective coolant temp sensor & replace broken cracked vacuum line
picked up vehicle and drove it a mile - still doing the same thing
any one have any thoughts? sorry for the length but I didn;t want to leave anything out. I dont feel I know enough about cars to argue with mechanic but the vehicle did not do this before fuel pump installed he denies that his work has anything to do with this
any help would be greatly appreciated
thanks Sandi
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First thing I would do is dispute the charge or stop payment on the sensor just done, then go back to him and tell him if the sensor was bad the engine would flood and run rich as well as race, and it is still doing the same thing, what did he plan to do now??!! When you drove ot did it race immediately? It is still possible for some reason someone turned that screw in, the dealer's scan readings confirm that ,show it to the mechanic, either way he did not fix your problem.

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upon first picking up your vehicle, you should always take it around the block & make sure everything is working properly before just leaving. this way you can ask things like, "why is it idling high, if you replaced the fuel pump (which is located in the fuel tank). the two things shouldn't be related, but - in trying to diagnose the initial problem, perhaps mechanic #1 was "investigating" something at the throttle body & adjusted something incorrectly as an attempt to see if making such an adjustment would affect a cure. if the thing will drive to 50mph without touching the gas, then it sounds like the throttle is open as though the screw was at the max limit. ask them to actually show you the screw in question. if this screw is somehow teetering on the edge of breaking off, why can't they simply drill it out & either ez-out the remainder, or chase the threads with a tap & install a new screw? i would also check the throttle cable adjustments - if it's too tight, it'll hold the throttle open like that - since it's impossible to know what mechanic #1 did, & you couldn't ask him why it was running so fast at the beginning, it's tough to say without actually looking at it, but i'd ask them to show you the screw first, & see why it is that it couldn't be drilled out & replaced.
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