Driving my car in town I noticed that when speeding up and trying to upshift I release gas the car keeps revving at about 3000 rpm for 3 seconds and then goes back to normal idle.
When the car is parked and I quickly push gas pedal down to bottom and release gas the car idles up normally, then comes down to 3000-3500 rpm, stays there for 3 seconds then goes back to normal idle.
This all happened after the mecahinic changed the injector nozzles, fuel filter, spark plugs(bosch super 4-head copper), and hooked up a small computer to the car. He fixed the car's hot start problem but now the car is having the above problem.
Anybody has any idea why this is happenning please help.

Hurshi
1989 230E

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1989 230E, 8v, 166.000 km, updated to 94/95 trunk & hood
2002 Daewoo Nexia 50.000 km
Sold:
1987 VW Jetta GLE 16V, Recaro seats
1982 Volvo 240 DL (lovely car!)
and few more american cars.