gear. Anybody know why? it idles good in park and neutral but dies in gear. I changed the plugs and wires. Somebody said maybe my coil but they are kind of expensive. Please help.

it could be because you are putting a load on it. maybe the idle is set to low or maybe you have a vacuum leak coming from somewhere there are lots of reasons this can be happening. i would start with a fuel injection system cleaning and a check of all vacuum hoses