Hi. I have a 2000 sunfire. Its a 3speed auto. Ive changed tps, iac, ict (intake temp sensor), map, timing chain. Both times i got the scanner its bat was dead so i havent checked running data (koer). for some reason each time the engine light tirns on its a new and pointless code like this last one p0453 ftp sensor high volts. B4 was the intake temp sensor, and b4 that was the o2-1. Ive had a few cavaliers with the 2.2ohv. This one is a wierd one tho. Heres how it goes.... now, the car runs great as long as u stay under 3000rpm. U can play with the throttle to keep power under 3000 and it does wonderful. Plenty of power and response. At WOT from a stop is takes off like its got power like its supposed to.... till it hits 3000 rpm where all of a sudden the acceleration just stops and it gets stuck at 3grand (it wines and wails) till i let off the throttle enough for it to shift and rpms to fall below 3grand, then it will pull again like its supposed to.
Ask any questions, i can answer them all. I have any tool or can get it easly. Any suggestions will help. Im hoping i can get the scanner (snapon) next week and ill give freeze frame and real time data. Im jus hoping i can do this without scanner so i dont get stuck with a favor.

i have a 96 sunfire vert with the 2.4 ld9 twin cam, it does the same @ 6000rpms idk why (could be the 212k original miles but idk). if you hear anything id love to know.

it sounds like you've got a pluged cat. have you checked exhaust backpressure at the #1 ho2 sensor?