Conceivably, could be hydraulic lifters acting up one time and not the next. Some may leak down when the engine stops at a certain angle of rotation and then not leak down when it stops at a different angle the next time. Probably not the most likely thing, but the comment that it is almost like it is dropping cylinders could come from that. (But erratic ignition would do that too.)It's the motor, no lights are flickering. Motor just acts like cylinders are dropping off. Next time everything runs just fine. It comes on goes, almost like its loading up but runs great the next time.
There would be noise associated with it.Conceivably, could be hydraulic lifters acting up one time and not the next. Some may leak down when the engine stops at a certain angle of rotation and then not leak down when it stops at a different angle the next time. Probably not the most likely thing, but the comment that it is almost like it is dropping cylinders could come from that. (But erratic ignition would do that too.)
Good point. Or water in fuel.Trash in the tank clogging up the sock on the sender unit... maybe? Car gets moved or the engine shut down (no fuel pressure) the debris falls off the sock. No blockage then but after the engine gets ran it blocks the sock. Just guessing.
Booster vacuum adapter only has the one 3/8 port to manifold.I had a problem similar to this on a 74 dart sport 360. Ended up finding a split in the extra plug on the power brake booster, sometimes it would suck together and seal and at other times it was a huge vacuum leak, just to look at the plug it looked new.
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I'll let you know the findings, thanksFrom your descriptions, I don't think this is your problem,but To check if the running fuel level is stable,
With the engine idling clamp the fuel line.
One of three things is gonna happen;
A) If the fuel level is too high, the engine will slowly smooth out and pick up rpm, then continue as at B) below
B) If the fuel level is about correct, nothing will happen for about 15 to 30 seconds, then it will slow down and continue as at C) below.
C) If the fuel level is too low, the engine will slow down, run rough, and eventually stall.
I also am wondering if you have an intermittent vacuum leak, and because of the severity, Ima thinking the PCV is cracked. I've even seen them broken and the only thing keeping it together was the engine vacuum.
If you thing it's ignition;Isolate the cylinder or cylinders. Just pull one wire off atta time (engine running of course), looking for wires that make no difference. Then you just have to prove the wire, the plug, the tower, or the valves are closing..
That would make sense, open to open. Just not sure about the stock manifold to TQ.I run my thermoquad open with a spread bor to square bore spacer in my intake runs fine.