Problems: Hi my son has 1993 grandprix 3.1 4 speed auto.the car cuts out
and buck under load. is fine at highway speed .runs good at idile. also no
problems in reverse. change wires coil pack plugs.scaned computer no problem
codes everything looks good. banged the computer to see if anything is lose
in side. wonder could it be a lock up solenoid or module or bad computer.
any idea. also
hi check the fuel pressure at idle it is 38 .when you shut of the car it hold at 40.when in drive with foot on brake I rev it up it goes to 42 pounds before it cuts out ,is that enough pressure.it is fine in reverse and on the highway .will change fuel filter thanks Ron.
