I have a stock (to my knowledge) 97 GTP with 227k miles that I just bought a few days ago. The car idles decent, drives alright but wheni hit the pedal hard I get a hesitant or sluggish response, it also seems to be worse if A/C is on (could be my imagination). Just yesterday the car was bogging down real bad while idling and driving (putting noise and feel), service engine light was blinking so I knew something was seriously wrong. Today (6-29-17) I replaced all the spark plugs and wires, plugs are ACDelco Iridium PN# 41-101 and a Duralast wireset PN# 4690 . After replacement was finished i started up the vehicle and to my relief it idles a lot better, maybe not 100% but a heck of a lot better than the previous day. When I went to drive it, it also seemed to accelerate quite a bit better but still has some hesitation. Check engine is no longer blinking but still present. Have not had time to run codes yet but will tomorrow morning. I also have a brand new fuel filter I plan on replacing tonight. If anyone has ideas on further steps I can take to help my car run and drive as good as it can i would be extremely happy to hear them out and possibly try them out. I don't want to add performance parts until i know the motor can handle it (unless someone thinks differently). I do know the car has high mileage and seen its prime but would still like to make it perform as best as possible. I am no mechanic by any means but want to start working on my own vehicles as best as i can A.K.A self taught by my good pale "YouTube".
P.S. **I ran the codes before the service engine light began blinking and the only code that showed up was P1652 - Fan 2 relay control circuit. Did not think much of it because im not sure what that means so if anyone knows if the could affect the performance please let me know or what it even is or means. Thanks for reading hopefully I hear from some of y'all soon!**
