20 Most Recent 1990 Pontiac Grand Prix Questions & Answers

TPS - throttle position sensor .

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I have the same car. My solution was to first test the TPS, throttle position sensor, test is on Autozone site. 2nd, test the three wires that go to the TPS for integrity(simple volt meter set to ohms scale- readings should be close to zero if the wires are intact and not broken or touching a ground.) TPS sensor runs around 17 to 28 dollars. Ill bet you a dollar to a doughnut hole thats your problem my friend

more than likey in the dash board side and if not there under the hood - but check you owners manual first for the info

check and change the sensor on the transmission always check your wire harness for damages

There is an adjustment on the side of the trans that changes how it shifts. Try looking online about it.

yes...if you car is a 6 cylinder..then there are 6 plugs...just find 6 identical wires that all murge on one device (ignition coil) follow the wires to the other end where they are connected to the spark plugs... just pull the wires loose..then unbolt the sparkplug.. bolt the new one in.. then reconnect the wires in the same spot( do 1 at a time so they dont get mixed up...

It could possibly be that there is a wore spot on your throttle position sensor (TPS). It basically is connected to the cable running to the gas pedal and tells the computer how much you're pushing down on the pedal.If you find that it's bogging down more and more often (like when you need more power climbing hills and never really gets going), it could be that your catalytic converter is clogged, but this will eventually throw some check engine lights.

adjust idle up adjust up untill no problem idling while in gear use 2 people some one in car braking

Could be clog catalytic converter.Tune up fuel filter,coils,air filter.

Could be low fuel pressure, a vac leak, or a faulty throttle position sensor. If the check engine light is on you would check the computer for trouble codes next.