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Re: VERY dirty throttle body (inside)
Hold up, those residues are stuck to the inside of the manifold. If you loosen up that junk and try to burn it, you'll foul the plugs and junk up the O2 sensor & catalytic converter. There's no hurt in just letting it sit there. If you just can't stand it, remove the entire intake manifold an clean it away from the motor...then do it again every year.
Concerning the leaking intake valve, if it leaks during the ignition stroke, won't it light off the extremely volatile air/gasoline mix inside the intake port and making popping noises?
I'm having a little power loss on my '92 CPI right now but I think it's the fuel pressure...it's jes' barely 50 psi and the spec is 55-57psi.
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