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Posted

Starts up normal. Few seconds something seems to click on or off and the pressure goes from 40 in the middle to around 60, then starts to shake and run rough. Put in a new gm fuel injector. Swapped around the spark plug, coil pack and wires. No change. compression check showed 150-160. 
Not sure what to do next, maybe take off the valve cover? Ideas

thanks in advance 🤙🏽

Posted

Yup, time to pull the valve cover and check the valve springs and see if that lifter is moving the rockers up and down like normal.

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