Engine sounds and shakes like it has a dead  cylinder. I had new plugs
installed and went thru the entire ignition system and all ran perfect -
idle and at 3000 rpm per Tencent. Even put in new ignition wires because
testing them with a timing light can be faulty. My Shoebox Electronic gizmo
shows the ECU  fuel injector pulse proper - but tells me nothing about each
injector. The injectors were cleaned, serviced and tested Cruzin a year or
so ago. Seemed OK. I have'nt pulled and test them yet for lack of  seals.
So it is yet to be done.

Except for the injectors, I am stumped! Any one have any ideas or
suggestions. I'm all ears!

Also -  could anyone tell me the proper plug length to  be screwed in to a
cylinder head.

Thanks

John the Gimp