It is sort of a stumble when I press on the gas after being stopped. Once going it doesn't do it any more. It just started lately. Mostly just does it when the AC is on, but I think it did it a couple of times after the AC was off. Any ideas?

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

I am guessing there must be some compensation for the extra drag put on the engine by the compressor. And now maybe that compensation is lacking for some reason? Maybe a bad sensor? I tried searching but "AC" can't be searched on because it is too short...

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

Basicly only 2 things can make a difference on acceleration, fuel pressure & air mass.

1 of those items are to blame UNLESS you are getting a low ignition voltage misfire.

That could be plugs, wires, OR coil(s).

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MERCEDES Benz Master Guild Technician (6 TIMES)
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Retired Moderator

Hi MB Doc,

Thanks for the reply. I did have to change 1 coil very recently. The connectors looked fine. The plugs have about 90K on them so I have some ready to put in. Do you think maybe the other coil is going out? I have no CEL at this time. It does happen a little even when AC is off. But much worse when AC is on. The AMM is fairly new (OEM Bosch part).

Thanks

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

I have no codes. It comes and goes, but definitely worse with AC on. Could it be the coil? I don't want to shotgun parts, but there is no code. Could it by the trans?

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

I fixed it. I replaced the plugs and the connectors under the coils. The plugs looked fine and the connectors measured fine with my ohm meter. However, the hesitation is gone. So I will never know which was the problem. Can plugs be bad with out looking bad?

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra