I've got a 92 Pontiac Grand Prix with 152k miles.
the car runs good when cold but when hot it runs
like is missing from a spark problem, it does not
do this all of the time. sometime runs fine and
other time misses. someone told me that it could
be the EGR valve. it shows no codes in the computer
and every now and then the "chech gauges" light
comes on... Help please!!!