My 94 seems to idle fine but when I give it throttle it bogs really bad. It started out as an occasional issue and has gotten progressively worse. So I pulled the expensive NGK plugs and put in some cheap autolite plugs as that seems to be whats recommended and the NGKs were black.... REALLY black! Could it be the coil is bad or would it be more of a fuel issue?

 

common causes for bogging would be plugged fuel filter, plugged air filter or plugged exhaust. Id start with a fuel filter since they are cheap and it could probly use changing anyways

 

Well air and fuel filters are both new however I just did a fuel pressure test and it had 30psi the book said it should have 30-45. I also checked the vac hose on the fpr and though it wasn't very snug it hadn't come off but there was some moisture in there. But once I was done with the test and put everything back she seems to run fine so somehow by checking the fuel pressure I fixed it?
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Ok so I put in a new fpr and the problem came back then I realized that there was a crack in my stock intake tube and the seals where dry rotted so I made a new intake and it's much better but still hesitates sometimes and lacks power. Any ideas?

Thanks
Joe

 

So I borrowed an OBD1 code reader and it flashed code 59 which among other things could be a fuel pump issue?

 

Check your EGR system and purge system

 

I was gonna try cleaning the egr valve but can't seem to find it.

 

Look on the drivers side of the engine. It's made of metal and hooked to an EGR tube. It's round with a cap. I would replace it if you haven't. I changed that and there's two other EGR parts a solenoid and something else. Took some blaster to get it loose. Took the tube off and ran a wire brush down the manifold and vacuum to suck out build up. Be sure to change the hoses too. Before that I would look at the throttle body and change the hose there it's a small one for the purge system. If it hasn't been replaced it will pinch off and be rotted out stopping fuel vapor flow.

 

Yeah I found some pics of an egr on a 95 and I don't think my 94 has one but I'll look again and let ya know what I find. Thanks

 

It depends if your truck is from California or not, mine is from Washington and did not come with one. Double check to be sure, owners manual mabe?