AD,
Along with cracking the injector lines one at a time (watch your tach to be sure the engine slows as each line is cracked and speeds up when tightened), I would also remove the oil filler cap on the valve cover while running and watch for steam/ base pressure rising out. I have 135 Lehmans and don't show anything. If one cylinder is not contributing, and you see base pressure/ steam- this could indicate low compression on that missing cylinder. IF that were the case, it could possibly be the result of overheating.
1983 Present 42 Sundeck
Twin Lehman 135's
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Steve Point Cadet/ Biloxi, Mississippi USA
*Present 42 twin 135 Lehmans
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