I have a problem my .1995 Buick Riviera 3.8l supercharged engine starts then dies after seconds scan tool won't read the obd2 plug on the car I replaced the cam sensor crank sensor fuel pump and fuel filter there are no vacuum leaks and the pressure regulator does not spit fuel when i start it the fuel pump comes on when i turn the key on the relays are fine I've tried jumping the pins on the obd2 plug nothing blinks I've cleaned the maf sensor it has both its wires did not test it but don't have a scanner that works and the spark is fine as well I am really getting frustrated and can't figure it out.