had same problem withe same truck and motor, there was a crack in a fuel line that let it suck some air, it would compete with the onan for fuel one or the other would run great but not together, i also had the same result from a airfilter that was 4 months old, u can call me at 309-202-4398, good luck, Troy Lawhorn.
Re: 3116 cat ..in gmc t-40
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