Hi everyone, I just bought my mom's 2000 Grand Prix GTP. I love the car but it needs a ton of work since it has 100k miles. Under light load the car runs fine. If I try to excellerate up a hill or try and pass the engine stumbles and bogs down. I don't have a computer, I was wondering if this is a common GTP problem. I'm not sure if it is a fuel or spark problem. The accelerator pedal actually vibrates a little when I try to accelerate hard. My guess would be a TPS or possibly MAF. I doubt the exhaust is plugged. If there is a search term for this let me know. I tried "engine bogs under load" "bogs".
I didn't replace the fuel filter because the line was very rusty. I replaced the plugs, they were NGK and completely burned out. I replaced the wires and one of the head shields was melted. The center coil pack (5 & 2) had rusty terminals. I wire brushed them clean and used dielectric grease. Car runs great and pulls hard. I took my mom for a ride and she is mad she sold the car so cheap. Thanks.
