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I have been trying to dianose and fix a misfire on my 85 244 DL. The miss has a definite cycle to it, the engine will miss then run smooth for a few seconds and miss again(the interval is always the same). At higher rpms the cycle is the same but the interval between the miss is shorter. And with the idle adjustment screw all the way in the idle speed will only go as low as 900 rpm.
HERE IS WHAT WAS REPLACED/DONE
Idle air motor
spark plugs
cracked vaccume lines
spark plug wires
injector seals
cap and rotor
throttle body was cleaned
throttle plate reset
What could cause this mysterious misfire??
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