Turned the engine over and watched all rocker arms move. These all move the same distance visually, so I'm confident that rules out cam or lifter issues.
I'm going to run a vacuum gauge and see if there are any wierd symptoms happening when idling, and running at different RPM's.
Quote:
Originally Posted by cableguy0
Next step. Pull the valve covers off. Roll the engine over by hand and watch the rockers move. Look for any rockers that arent moving as far as the rest of them. Have you checked fuel pressure by any chance? Get a bottle of zinc additive in that engine asap.
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