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lonfu's avatar
lonfu
Explorer
Mar 16, 2016

p30 stumble problems/ fuel pressure regulators

Ok, so having a problem with up towing stumble when under load. I have 98 454 "j" 26wu Itasca on the last year that chevy produced it's P30 chassis. This stumble has been a real bummer, I checked the ...
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lonfu's avatar
lonfu
Explorer
Oct 01, 2016
Update: Checked my engine readings. still getting negative fuel trim values, -5 to -7. Coach seems to be running perfect. Idle smooth, temp in a good range, gas mileage varies between 8mpg over passes and 11mpg the flats of the desert.

I'm tempted to replace the idle mix valve to see if that is what is causing the negative values. Any one have any experience with this?

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