by 350chevy007 on April 5th, 2007

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Help answer this question below.

Bought a 1986 GMC c30 350, with supposedly 160 k on it last thursday

(day 1).

Motor started up good - idle was rough - engaged in drive , idle
really too low, when brakes where applied, it would backfire. Exhaust
manifold gasket on left side

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Answers. 1 helpful answer below.

by southern shadetree on May 26th, 2007
could be a bent pushrod burned valve or broken valve spring and even bad rocker arm start with a compression test to see which cylinder is giving you trouble take off your valve cover and see if anything looks broken if everything in the top looks good it could be a lifter cracked piston or broken ring
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Bought a 1986 GMC c30 350, with supposedly 160 k on it last thursday

(day 1).

Motor started up good - idle was rough - engaged in drive , idle
really too low, when brakes where applied, it would backfire. Exhaust
manifold gasket on left side

Answers. 1 helpful answer below.

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Bought a 1986 GMC c30 350, with supposedly 160 k on it last thursday (day 1). Motor started up good - idle was rough - engaged in drive , idle really too low, when brakes where applied, it would backfire. Exhaust manifold gasket on left side

Answers. 1 helpful answer below.

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Bought a 1986 GMC c30 350, with supposedly 160 k on it last thursday

(day 1).

Motor started up good - idle was rough - engaged in drive , idle
really too low, when brakes where applied, it would backfire. Exhaust
manifold gasket on left side

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