84-190e has miss

[420sel man]

(84K MILES, 2ND OWNER)I LOANED MY WIFE'S CAR TO DAUGHTER, WHEN WE GOT IT BACK IT HAD A MISS AT IDLE AND ON ACCELERATION. I COULD BEARLY DRIVE IT. MY WIFE IS NOT PLEASED..........SO I INSTALLED NEW PLUGS, WIRES, DIST. CAP AND ROTOR BUTTON. RUNNING A BIT BETTER, BUT STILL OCCASSIONAL MISS AT IDLE AND HESITATES ON ACCELERATION. NOT MUCH DIFFERENCE BETWEEN COLD START AND WARMED UP, BUT SLIGHTLY BETTER WHEN FULLY WARMED. AT LEAST I CAN GET IT IN GEAR AND DRIVE IT NOW (AUTO TRANS). NEW FUEL FILTER ABOUT 6K MILES AGO. FILLED TANK WITH HIGH TEST AND A CAN OF 2-IN-1 FUEL ADDITIVE. MY GUESS IS THAT I'VE GOT A CLOGGED INJECTOR BUT THE MISS SEEMS IDENTICAL TO AN ARCING PLUG WIRE OR A BAD SET OF PLUGS. I AWAIT YOUR COMMENTS AND SUGGESTIONS.