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1997 Silverado missing


Plinkin

Question

Hello I've got a 1997 silverado with a 5.0 and an automatic transmission. My problem is that when I level of it has a miss that you can definitely feel, at idle it's pretty smooth and acceleration is decent but not great. So far I've change the spider injectors, fuel pump, fuel filter, coil, icm, distributor, rotary cap and button, plugs and wires gapped myself, crank shaft ps. I was getting a vel that said random multiple missfire but it went away after I changed a few of these listed above but the problem still remains. I'm fairly certain the fuel pressure is good 55psi after that I'm at a loss as to what to check next. I've ordered a 2 book service manual so I can start checking the resistance and volts of sensors. This has been going on for a few months and hasn't changed. It used to break the tires loose in the back pretty easy, now it just revs up. The truck has 190000 or its a mpi 5.0 with a automatic transmission. Thank you. Not sure if this is relevant to the problem. Fuel pressures: idle 48 psi, hard acceleration 55psi, constant throttle leveled at a speed 45-48 psi, cycling the key on and off reads 55 and the jumps to 51 psi after a second or so and drop is not gradual I've got a new Delphi fuel pump with sending unit on the way.

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Might have an intake manifold gasket leak (common problem), or a good sized vacuum leak. Usually you'll get lean codes for big leaks. This one may just be big enough to effect drivability and not set a lean code.

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