i have a stock 89 camaro iroc z that i keep very well maintained it has a 305 tpi with a 5 speed standard transmission and a new problem just popped out and it is stumping me when i start the car the rpms with start at about 2500 and then slowly drop down to about 500 half of the time it will stall and the other half it will shoot back up and its a continueing cycle until the car is warmed up i am almost positive it has something to do with the tps sensor but i dont know if thats the only problem if anyone can i help that would be awesome thatnk!