My 2003 Buick Regal

some of the computer have a rev limiter built in and it would give you what you are writing about there my not be anything wrong

Feedback ?

You need a repair shop to diagnose
ALL the codes & resolve ALL the cars
problems,not a guess without a vehicle to test

I have a 1997 ford E 150 customize mark 3 van have driven back and forth to work 5 years ran great Christmas Day drove down to the garage and back up to house and now it will not start turns over has spark will not fire

Replace your MAF, its a little pricey around $280.00 or so but this will clear the code but make sure you have the ECM reprogrammed to perform a "learning" sequence since sometimes the code will not clear even though the vehicle will run like new. This reprogramming will most likely have to be a dealer performed procedure.

sometimes is hard to get there and cost a lot of money.

I would check for a dirty throttle body and a faulty idle air control valve.

First if you did not reset the computer after you replaced the throttle position sensor then do so and if that fixed the problem.If it did not help then replace the coolant temperture sensor and the coolant level sensor then reset the computer.If you replace any sensor you have to reset the computer or the computer will not reconize it as being new and won't reset the perimeters for that sensor.

replace temp. sensor

ur having fuel supply or poor electrical supply problem thats why the engine cuts off underload/ check spark plugs or airflow meter condition as well....

Possible vacuum leak.