I have been trying to figure out the problem with acceleration. My 1990 comanche idles fine and starts every time. when i driver she has extreme lack of power and get a shake at 55 . she will got 75 all day long but no acceleration. anyone have this problem. distributor issues? the cap and rotor were replaced about 6 months ago . anyone have this problem? thinking of replacing distributor , cap and rotor? ANy help would be appreciated