This may be poor engine performance.
Low engine vacuum will cause a vacuum modulator to sense a load condition when it is actually not present. This will cause delayed and harsh shift. Delayed shifts can also result from action of the throttle valve assembly, if the engine runs so badly that the trottle pedal must be frequently pushed to the floor to keep it runing or to get it going.
Check your the fuel pressure first, and also check if the catalytic converter is plugged, because that could cause the same problems.
Wednesday, January 10th, 2007 AT 10:07 AM