I figured out which cylinder it was because when i cracked the line the rpms went down a little.
Has anyone ever had a situation where the delivery valves were NOT
The rough running sounds like an injection pump problem, perhaps sticking delivery valves. Try adding a qt of two cycle engine oil to a full tank ...
Engine misfires can cause the driver to feel a jerking motion while driving.
This car did sit for quite some time, not sure how long. I took a delivery valve out of a spare pump I have and it ran like a top.
Pump? Delivery Valves? It idles smooth as hell. I have another truck to
Weak valve springs will typically cause misfiring and a loss of power as engine speed
This is a pretty common 12-valve p-pump problem, generally a light miss
or an EVAP purge valve that is stuck open and is flooding the engine with fuel vapor.
that actuate pistons very quickly as part of the engine's fuel delivery system .