1992 Ply Voyager 3.0
Starts run great at idel put it in gear and start running rough at idel give gas runs perfect does not eat alot of gas only does this at idel in gear?
Sounds like you may have a vacuum leak.
Check for vacuum leaks changed the fuel filter plugs wires are good dis is good good cap good rotor timing is right on the money no computer errors i drive it everyday but would just like to know what might be wrong, going to make a tool to check fuel pressure this week
vacuum leaks can come from many different sources. Such as: the brake
booster, vacuum modulator, etc. Are you sure there is no vacuum leak?
You say it runs fine until you put it into gear? Try engaging the parking brake when you put it into gear and see the results. Could be a bad booster.
Another thought could be water in the fuel. Did you recently fill up prior to the change?
well disconted the booster and and plugged the line still the same thing