It could be the crank position sensor.(?) It's a smallish gadget bolted to the back side of the bell housing on the drivers side. It uses a plug so you'll need a set of pliers to get it apart, and about every drive extension and gooseneck extension you own. It's best to jack up the drivers side front and reach it from underneath. If that sensor goes, it's about like the older Plymouths ballast resistors, when it goes, it kills EVERYTHING. Simple part, simple fix, huge PITA when it goes bad.... The crank sensor used to run about $50 or so. If you have a garage do it, they'll prob tell you they need to pull the tranny. Hope this helps.