car won't start

I have a 97 grand prix with 3.8 with 132,000 mile good spark new fuel pump new fuel pressure regulator. all parts from auto zone :banghead: help

Are you getting the 2 sec fuel pump prime at ignition to ON? How about fuel pressure per specs at the front fuel rail?

it is 52psi down to 46 w/ key on and 50psi cranking the engine

Thats good and you sure there is spark? Did you get it scanned for any possible history odb-ii codes? And are the fuel injectors firing?

I took the coil wires off and was getting good spark between the 2 posts. The codes that came back were random misfire, mass airflow & heat oxygen sensor #po135, po#107 and po#300

Disconnect the MAF sensor and see what it does.

I did that and still will not start

Did you check all relevant fuses to make none are blown. Like to the PCM module and sensors. Check IGN1 - UH at the main engine compartment fuse box. 80 pin connectors at the PCM module?

The fuses were all good and I did a noid lite test all good

I was able to finally get it started and now I have 2 codes po300 and po502. Any suggestions?

The P0502 DTC is an issue with the Vehicle Speed Sensor (VSS). Located on the right side transaxle extension.

How old are your spark plugs and ignition wires?

Is the P0300 a history or current DTC?

I pulled the plugs and they were soaked with gas. I cleaned them and reinstalled them and cleared the codes, no issues at this time. I am now thinking the whole problem may have been a bad fuel regulator dumping too much fuel.

It could have. Did you replace the O-rings on the new regulator? (if it didnt come with new ones).

yes come with new ones thanks for the help