with timming or a compression problem ie valves to tight you can lose all hp.
to test compression you need a compression tester that screw's in where the spark plug goes (remove all spark plugs)follow the instructions for your tester (remove the coil wire ect) do both dry and oiled checks a leakdown tester can tell more of what the problem is but is a little more complicated.
sometimes its obvious like 4 cyl on one side are losing compression or one cyl is dead or all 8 are down so try running a compression test or leak down if you can and post the #'s
check plugs and see hoe they are white black ect.
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89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .
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