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A while ago I solicited reasons for a rough running 240.
Here it is:
Bad battery/starter cable connection
Vacuum leak
Fouled plugs
idle speed is too low
Fuel Pressure Regulator
Throttle body
Injector seals
grounds and fuses
water in tank
Timing jumping back and forth from 12 to 15 DEGRESS
grimy Idle air valve
grimy throttle body
Dirty injectors.
Old fuel filter.
Clogged flametrap/breather box/PVC system
Dirty air filter.
Bad plug wires or distr. cap. Look after dark for a light show
Bad compression in one or more cylinders]
Bad AMM
-bad crank sensor
idle control valve
injectors with a poor spray pattern (kjet especially)
old plug wires
Bad gas.
Clogged fuel filter.
Failing / failed intank / main fuel pump.
Oxygen sensor.
Intake Manifold gasket leak.
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