IAC valve problems
IAC valve: It is in charge of regulating the air flow into the engine when the throttle is closed or idling.
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Acceleration failure
Opel Vectra 1997 167000 miles
When pressing the accelerator pedal thoroughly, the vehicle suddenly chokes. When releasing the accelerator, the engine vibrates and seems to be about to stall, but then revolutions raise slowly. I've already changed the TPS, CKP and oxygen sensors, the IAC valve and injectors; the engine has been adjusted as well, but nothing got better. Even more, when setting the D-type overdrive, revolutions drop and the engine stalls, without moving any longer.
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ES
There is a wire with a sensor that leads to the cylinder block. They are three wires that, due to the heat, tend to touch between them, causing the failure you mentioned. It is not hard to solve but quite difficult to find.
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