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The vehicle speed sensor should be mounted on the transmission. Speedometer stepper motors are a common fault with GM products.
This is something you need to take to a shop to have tested. It is possible the fluid level sensor in the resivoir is not functioning as designed and may need to be changed. It could also be a fault with you antilock brake system.
Sounds like valve seals. Engine oil in the top of the head will drain down the valve stem through a worn valve seal when the engine is off. Once you start the engine the oil in the combustion chamber will burn casuing smoke. This is not a cheap repair but you might try an oil conditioner product.
Sometimes a alignment issue can be very subtle. There was a Technical Service Bulletin published by Ford. TSB 93-25-3. There was an alignment issue caused by the A/C compressor mounting bosses being unequal. I agree with the other responce. I would also look at the tensioner. Make sure it has plenty of tension and that there is not an alignment issue there either. There are also belt wear marks on the tensioner. Sometimes when purchasing non factory belts the belt length may not be perfect and the tensioner may be bottoming out. The other thing to look at is the depth of the power steering pulley. If it has ever been serviced/ changed someone may have pressed the pulley on too deep etc.
The only thing that comes to mind is a loose or worn suspension part? We usually charge a small fee to pinpoint the cause of noises like these, but we could discount the testing charge or credit the testing charge toward a repair. Did you have a wheel alignment service performed recently? Give us a call and set up a time to swing by. We would be glad to check it our for you. We might be able to give you a better idea if I could hear your description over the phone.
I believe there is a software update for similar issues. Check out Technical Service Bulletin TSB 18-018-06. This TSB says to flash/update the software on the powertrain control module (pcm). The dealer may have done the update? They should have done the update when they changed the throttle body and harness. Possible causes are software updates, pcm(computor), throttle body, or harness.
What kind of noise? If you are hearing and or feeling a clunk, you might have a bad engine and or transmission mount.
If the belt slipped it probably bent some intake and or exhaust valves. This is an interference engine. That means if the timing belt brake or slips you may cause engine damage (bent valves etc.). This will be an expensive repair.
There are several control modules on this vehicle. Can you tell me what control module you are looking for? What engine does it have in it?
The cluster is in the dash but it's not part of the dash panal.