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97 gmc savana p0300 code

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      michigangmc97
      Participant

      SORRY FOR THE LONG POST!

      I am absolutely stumped, I have a 1997 gmc savana 2500 with the 4.3 v6 and I’ve been dealing with P0300 code (multiple misfires) since I bought the van. I’ve thrown the parts cannon at it and changed these parts so far:
      New plugs
      New wires
      New distributor
      New ignition coil
      New coolant temp sensors
      New crank sensor
      New spider injectors
      New intake housing
      New MAF sensor
      New air filter
      New fuel filter
      New thermostat
      New valve cover gaskets
      New donut gasket on the exhaust manifold
      New pcv valve
      New cam shaft sensor

      I’m still getting the code and it’s flashing at this point.
      I took the van to two shops. One local shop and one Chevy dealer. The local shop said it might be a cam lobe. I doubt it but that was what they came up with.
      The dealership said it was the spider injectors so I changed them out for the second time and still have the problem.
      I am absolutely stumped.
      For the record, cylinder 3 seems to be the most misfired cylinder. The compression and plugs are both good on all cylinders. I also checked voltage on most of the sensors and all of them have power.
      There are two possible things I’m thinking it may be: either the timing chain is loose due to wear or the donut gasket I put in may be leaking. I can kind of hear a leak but I don’t really feel any air coming out. The reason I bring this up is because my fuel trims are around 40% and they should be at 10% so I’m wondering if air is getting in through the exhaust leak and the O2 is reading the excess air and compensating with fuel. Im not an auto mechanic but I’m reaching out because I need some help. Thanks in advance and I hope I can get this all figured out.

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