I bought one spark plug and did the exchange thing. Wasn't the plugs BUT when removing one of the wires it broke leaving the clip part with the crimp on the plug. I got a new set and it wasn't the plug wires coz the same stuttering occurred. So II decided to clean the throttle body and make sure the two vacuum hose inlet on top of the TBody were clean ( sprayed cleaner through both holes ) and they were, so was the throttle body as I had cleaned it a while back. Anyways , as machine man mentioned , I looked at the throttle plate and in the "'resting " position I can see a very slight space at the top and bottom. A heard the the TPS click when I rotated the plate just a tiny bit. I'll see if I can make an adjustment so the plate closes up totally. I take it that is the way it ought to be. The stuttering occurs between 1300 to 1500 rpms ( the transition?) . The car idles perfectly. Once pass the "transition" it will keep a steady rpm with no problem at all. An observation Is when the stuttering occurs and I hold the gas pedal steady it will after a couple seconds begin revving up. An occasional back fire occurs during the stutter. Regarding the two vacuum hoses I put my mouth ( Geez!!) to both and blow and inhale and they both appear not to " leak" . Also during a stutter event I pulled both hoses off the TBody and nothing changed. I'll adjust the TBody plate and report back. One other thing I'll probably do is return the cam timing back to TDC and see what happens.I had installed an IPD variable cam and advanced it to 2 degrees. Then again the car was driving perfectly but we will see. Cheers
Paul