Car: 1989 260E, 198,000 miles.

There is a one to two second lag in acceleration when I floor the accelerator (but without engaging the kick-down switch) whether from standstill or at speed.

The pedal will contact the floor, and the fuel economy needle will move, but the tachometer will not budge for a second or two. Then it surges, making for a jerky ride. I was initially told this was a fuel delivery problem, but I am wondering if it could be an air flow issue.

I know I am running lean. The last thing I did to the car was replace the Thrust Cutoff/Throttle/Decel micro switch to correct a fast idle.

Help. I want smooth, steady acceleration.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black