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Old 02-17-2008, 12:27 PM
ctaylor738 ctaylor738 is offline
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,318
It could be a number of things:

- Vacuum leak. Check all hoses and connections.

- Vacuum advance. You need to put a timing light on it and look for a "snap" of advance when you blip the throttle. If you don't see it, then the diaphragm in the distributor has probably gone south.

- Fuel distributor. Jumper the fuel pump relay and with the pump running, press down gently on the sensor plate. It needs to move with no resistance. If you feel resistance, the piston in the fuel distributor is sticking, which means that the piston is not moving fast enough to supply fuel for quick acceleration.

- Other fuel supply problems. Warm-up regulator, fuel filter or other supply problems, fuel pressure. You need a pressure gauge to chase this any further.

Is this happening all of the time, or when the engine is warming up?

Is the car running OK otherwise?

What is the "economy" gauge doing when the engine is at idle?

Is the idle nice and steady?
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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