i have a 91 f250 with a 351 with an e40d trans when truck gets hot she is a real dog. dose this truch have a mass air flow sensor also what parts on this truck affect the fuel mixture?? trans shifts good but when warm seems like no torque and engine lacks power please any sugestions would help

 

There is no mass air on your truck,but does it sound like it's missing after it warms up. The TFI module could becausing your problem. AutoZone and some of the other parts stores should be able to check it out.

 

I don't think AutoZone does preOBDII. Maybe a fuel filter and tune-up may help, but think your going to need to manually test all the sensors. If engine light is on check the code

 

They've got the equipment to check the modules but you have to take it off and take it in.I tested a many of them when I worked for em. The test equipment should be located near the battery testers.

 

will thats good to know, may have to check them out myself with some good sensors first
Also he still will need to clear codes if check engine light was on.