DAMMIT RAY ! (old indian saying)

RustyRatRod said

A lot of times an intake backfire blows off vacuum lines that may be plugged into the intake. It could also blow the gasket out from under the TB as well. Any of those would result in a higher idle as they would be a manifold vacuum leak.

Isn't that thing pretty high compression? You need a colder than normal plug in that instance, not hotter.

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RRRRRRRRustyR R , hit it right on the head! I went out in the garage for a bit today, took the hood off and started looking for a reason for a vacuum leak. when it backfired it blew a rubber cap off the extra 3/8" vacuum port behind the throttle body, there are two 3/8" , the other is hooked up to my pvc valve. I couldn`t find the plug so I made one w/ a teather on it to contain it in case it happens again. Kinda like an explosion panel . Thank GOD it wasn`t serious ! ROB, I`ts only 10.3 comp. It has been blackening the plugs, even tho I have it set leaner than the built in settings. Easy to change stuff w/ the handheld for the fuel inj. ! HAPPY CAMPER AGAIN !!