I have a 93 f150 6 cylinder I have replaced:
distributor
wires and plugs
fuel pump and filter
injector's
all the sensor that I can find
cpu

It starts and runs great until I put in gear then quits running. Put back in park or neutral will run all day

what am I doing wrong!!!!!!!!!

 

What you are doing wrong is that you are guessing and buying parts blindly making your parts guy rich.

I would start by measuring your fuel pressure.Specs are 45-60 psi and should hold a while after the engine is shut off. Timing should be 10 BTDC with the spout connector disconnected. Manifold vacuum should be a steady 18-22 inches of vacuum at idle. Unfortunately, people start with the parts cannon and replace everything when they don't understand how things work. Don't be that person.

 

I don’t have a fuel pressure gauge. But try those things you mentioned. I’m at my wits end. When it is running you could set a glass of water on it and it wouldn’t spill a drop

Thanks

 

Most large chain auto stores have a loaner program where you can borrow tools and gauges with a deposit.

 

Thanks