Hey, I have 97 GST and just recently its been idling at like 300 rpms (and its automatic too) which isnt good, and now when Im driving and my RPMS get above like 3000 it starts to slip or like not catch and wont let me get past it. I have no idea what could be causing this. I just changed out my fuel filter and spark plug wires/spark plugs too. Any ideas? Thanks.

 

Boost leak. MAJOR one.

 

Dang. What would cause that to happen? And where would it most likely be?

 

Do a boost leak test to find out if that is your issue, do u have a check engine light?

 

Yeah, I did, but it randomly went off. I had autozone check it with their computer, and it said I had a misfire in cylinder 1. I dont know if its a combination of that and a boost leak, or just that, but its driving reallyyy crappy.

 

I would deff fix the cel. Try changing the plugs and wires and boost leak test.

 

Dang that sucks. Its weird though cause i just changed them so I dont know what else could cause it other than my piston rings

 

What kind of plugs and wires did you use?

 

Bosche platinum plugs, and then Onsoku spark plug wires that a guy gave me when he wrecked his tsi. He said they worked fine, but i guess who knows

 

NGK 6ES plugs and OEM or something listed for a 4g63, not an STi motor...different tolerances.
The 4g63 doesn't like other plugs, stick with NGK.