Symptoms of out of adjustment valves

[Hppants]

Did you re-torque the motor bolts?

[Festus]

I haven't since I put them in, when we put the engine back in 3 years ago.

I'm sure we can track the vibration down. My head scratcher is why it's not running good at idle, yet, no signs of power loss or poor running conditions at speed.

[FJRoss]

I haven't since I put them in, when we put the engine back in 3 years ago.

I'm sure we can track the vibration down. My head scratcher is why it's not running good at idle, yet, no signs of power loss or poor running conditions at speed.

At idle or low throttle openings an air leak or bad TBS could be responsible. Not so much at 100 mph.
I think that you are wasting time doing other stuff until valve check and compression are checked.
In addition, motor mount, wheel bearings and u-joint/rear drive for issues at speed...

The fact that power and running conditions are good at speed leads me to be less concerned about the overall health of the engine.

(I assume you are SURE that the valve timing is OK. Makes for a rough run, especially at or near idle...)

[raYzerman]

Too many threads on this subject, we should get back to the first one and document every thing that has been done (or not done). I'm losing track...... one item, no tank swap yet...... TPS is new, APS is new? Coils swapped, injectors cleaned, what else.........?

Definitely look for a vacuum leak.... I would also check the primary resistance (1.19-1.61 ohms) and secondary resistance (8.50-11.50 k ohms) of each coil (FSM page 8-169). If similar to prior Gens... look in the bottom and see if there's a brass fitting that goes onto the spark plug, and that is has a flat blade screwdriver slot. IF so, remove that brass thing, there's a resistor behind it and a spring..... take those out and generously clean/scrub with contact cleaner, reassemble and recheck secondary resistance. If you're very close and just barely outside tolerance, don't sweat it.

I'm going to write up a little saga I've just been through for the last couple of months and in the last two weeks..... might not help, but describes the fun....