[npasumar]

My car vibrates when stopped and in a gear, like at a stoplight. If I shift into "Park" or "Neutral" it stops vibrating.

Got it checked by a mechanic and his
conclusions were one of the engine
cylinder/pistons comibations was not working.
He isolated the problem by removing the spark
plug connecting wire one at a time and the engine
started to stop on 3 of them and on the 4th it
had no effect. He deduced that this cylinder was not
responding. He checked for the spark plug, and connecting wire
and they were good. Then he checked for compression and it
was almost the same on all the 4 cylinders.

He concluded that the injector was not functioning....

Car has 126K miles and no major tune up has been performed.

The mechanic is quoting $400.. is the
diagnosis and estimate correct?

What else could be the problem??

any ideas appreciated...

naveen