Check engine light on 1990 Ford Mustang GT

when on the interstate my check engine light comes on and goes off every once in a while. I just had motor rebuilt new tranny new clutch new O2 sensors I am lost. The only thing I haven't replaced is the fuel pump and fuel filter.

by in Murrieta, CA on March 29, 2011
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer 2 comments
ANSWER by , March 29, 2011
if you are changing altitude , the o2 sensors could be reacting to thinner air. it was not uncommon for obd 1 systems to re act like this. have it double checked at a shop to confirm. Roy
COMMENT by , March 29, 2011
The altitude isn't changing. It started after heavy rain but on the coast here there is no change in altitude
COMMENT by , March 29, 2011
ok, then you need a shop to pull the code with an obd 1 tester to get the code and diag it to determine the issue. if you give me the code, i can guide you from there. Roy