My 2002 4 My 2002 4 by 4 chevy blazer only goes up to 2500 rpms I have replaced the fuel pump and the mass airflow sensor and it still has not works what could be the problem please help!
Check air filter
Exhaust system high back pressure. They make a test kit at most local parts stores and it is a DIY unit.
^^^ most likely due to a clogged cat. There is a small chance a it could be the tps. Any codes?
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