i have a 1999 grand prix gtp coupe has minor rust but i was wondering if i should lightly mod it or not? the engine has 219k on it how much of a factor would that be? it's throwing a couple codes on the odbII scanner.
I got 230 k on mine im about to start a lim gasket today i think then go from there with bolt ons if it blows then i got bolt ons for my next motor right