You need to verify that the cams are timed, Yous ay you checked timing, do you mean cam timing or ignition timing. the ignition timing is based on the left cam, if the right cam is off, the ign timing will be ok. if you ck compression on left side, and its different (lower)on the right side the cam timing is off. this is assuming you have put evrerything back in correctly.
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Check for vaccum leaks is a good start. Did the belt break while running, can cause a bent valve, a compression check will tell you which cylinder could have the bent valve. what engine is in you truck?
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