Chevrolet Repair: Chev Venture van Problem, spark plug wires, vacuum lines

Question
Hi, After my 1997 Venture Van is warmed up and driving down the highway it starts to lurch in a rhythm. I only does it if I'm not accelerating or de-ccelerating, Only when gliding along in-between. As soon as I accelerate it goes away. I have Had the transmission serviced to see if that would help but nope. Any help greatly appreciated.
Aaron

Answer
The vehicle really needs to be driven by a reputable technician as the cause is in the FEEL of the problem. Possibilities are:

1. EGR malfunction.
2. Cracked spark plug.
3. Transmission shifting IN and OUT of overdrive.
4. Spark plug wires.
5. cracked/broken vacuum lines.


Could be just NORMAL A/C compressor cycling ON and OFF.

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