I have a 1998 gmc savana 5.7 v8 vortec engine. I have a p0300 code for random multiple cylinder misfires. If the van has been sitting over night it takes 3-5 cranks for it to start. It has a new battery, fuel filter, new spark plugs, new distributor. I cleaned the MAF sensor , installed a new air filter.

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No. 1-7
ZyxPandas
ZyxPandas

Major update. I replaced my exhaust manifold gasket and my Check engine light turned off

ZyxPandas
ZyxPandas

Just replaced the ignition coil, pcv valve, and ignition control module. And the oil pressure sensor.The check engine light didn’t go away I reset it to see if I’ll come back, I’ll check the fuel pressure tomorrow.

ZyxPandas
ZyxPandas

Update: I just noticed my oil pressure switch is leaking oil. The switch has only 1 prong but the wire harness connected to it has 3 wires and 3 slots. Should I get the 1 prong switch or the 3 prong one?

ZyxPandas
ZyxPandas

Another thing I just noticed when it starts it chugs at the very beginning and then it catches wind and runs smooth

ZyxPandas
ZyxPandas

I have not changed the plug wires, when I did change the rotor when I changed the cap. I’ll see if I can rent something to check the fuel pressure. I have used a ton of fuel injector cleaners and they didn’t help in any way. Lol that’s the video that made me know about cleaning the maf.