Thank you valleytech for your former response. My 92 D350 was in turn not blowing by the intake manifold. It was actually leaking out of the head where the EGR valve crosses over. Would this cause my maintenance light to stay on? The truck runs great after I adjusted the timing that was 20 degrees off. I pulled the fuel tank and found the fuel pump 50% clogged with aluminum. I am in the process of putting the intake back on and want to know if there is anything else that I can check. My truck like I said runs good but out of the blue the truck will backfire and stall any ideas? It does it enough to where I can not drive the truck. I vacuum checked the EGR and it opens under vacuum. I have also put new plugs, cap, rotor, egr pressure switch, purge switch, coil, breather, fuel filter, o2 sensor, etc. I have a feeling that whatever is keeping the maintenance light on is causing my problem (not the check engine light). Could it be the timing chain? It starts right up and idles like a champ. the timing does advance about 15 to 20 degrees when floored but is at 10 degrees btc at idle. I also checked the distributer and it is just halls effect so I do not think that anything is wrong with it. Out of ideas thanks alot!!! Mike
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Put it back together and see how it runs with the fuel pump and filter cleaned and the egr working properly, With 20 degrees too much advance the engine would backfire and run poorly
