T100 fuel pump relay and interia switch

The only vehicles that use an inertia switch are fords. The fuel pump relay should be in the fuse box under the hood but i doubt that is the problem. Irf the fuel pump relay was bad it wouldn't run at all.

What exactly do you mean when you say "the engine kills when I accelerate hard". Does the check engine light come on? When was the last time you had a tune-up done?

The truck will cruise at any speed 80 even 90 mph. If I'm cruising 60 or 70 and floor board the truck, it then start to accelerate and will just quit running. It will also do this if I'm eccelerating from a start.I then have to put it in neutral and restart the engine. It almost seems like the fuel has been cut off. Occasionally it will keep running and continue to accelerate. It doesn't do it at any particular RPM.

So what have you done so far to try and fix the problem ? Does the check engins light come on ? Scan for codes ? Check fuel pressure ? Check fuel filter ? Check for tune up ?

Mike