thanks guys. i was thinking compression test, wasnt sure though.

so i just came back from checking the car out, it looks and runs beautiful. the only problem is that its blowing a few codes.
the guy said they popped up after he put in his speed daddys. he checked on his aeroforce and said its throwing a high voltage and a low voltage code, 171 and 131. as well as a 135. what could cause these? and has anyone thrown a code for running too lean on a zzp canned tune?

and has anyone else had codes show up after putting in their speed daddy headers. Mine did and his did. i just dont want to end up in the same boat as i was in with my old gtp