Im 400 miles from home and having trouble. i have a 89 f150 4.9 4x4, it just started having trouble running. missing, stubling and idling really ruff. i changed out tps, coil, ing modula, fuel pump relay, and ecu relay. i pulled the number 1 plug out and left it in the wire on top the engine so i can see if it is sparking. well its sparking but very fait. not strong at all. so dont really know what else to do. the guys at auto zone said i should change out the rotor, cap, wires, and plugs. any body else have any thing they would like to add. i really need to get this truck going. im losing a lot of money by not having it running. im stuck in cleveland tx just north of houston

 

Sounds like cap and rotor to me.

 

I had a map sensor to die recently and it sounds similar to what you are experiencing. It ran like crap for real! Also, try replacing just the rotor button. Had a cheap one to crap out on me once.

 

Check all electrical connections. Check for good spark at the coil. If you've got a DMM test the coil and ignition controller. There is usually a cause to a sudden breakdown. Broken connections are the most common. What happened just before the failure. Did you do any work. CHECK FOR CODES.

 

Codes was checked i have no codes. I left the plug wire from the dis to the coil off so i could see the spark. It was hitting hard and brite. And it wasnt sudden as i said above it started by running ruff, then stumbling, to not running at all. But like i said the coil and ign mod was changed out. After i changed them it trys to crank and sounds like a stronger crank. Just will not run

 

Can you check fuel pressure?

One or two tank's?

 

Can you check fuel pressure?

One or two tank's?

How many miles in the fuel filter?

 

Its getting plenty of fuel, the spark for the plugs are super weak. U could barley see it under my hood in plan view last night

 

Remove your SPOUT Plug & try starting.

 

Spout plug?