1997 gtp
stock
156k miles
This problem has gotten way worse now. I used to just have a pop sound under load, but now it is bad hesitation if i go above 2500 rpms.
The rpms will drop down about 200 then come back up until i let off the gas.
I have sel codes p0420 and p0300.
I replaced cat and fuel filter, disconected the battery(does that reset codes?). And still have the same codes...
I would say it has gotten worse since i have done these things.
The old cat didnt look bad. replaced with a zzp high flow
the old fuel filter was bad tho, I could barely blow thru it...
I took one plug out to look at it and it looked brand new. (a little black on the white part)
The wires look brand new also.
Ive had this car a little over a year and the plugs and wires look like they are maybe 2 years old?
I think I am gonna pull all the plugs to look at them to see if this could be a simple fix.
Then maybe rent a fuel pressure tester.
Any help would be much appretiated.
Thanks,,
Eric
