I have a 1998 XLT with a 2.5,5speed manual,2 wheel drive. I'm having a similar problem.The truck was running fine,and all of a sudden started losing power as if out of gas. THe fuel pump is engaging,It's definietly not out of gas,I'm getting fuel to the fuel rail,spark at all plugs,yet she refuses to fire up. If I spry starter fluid she'll fire up. Checed all injectors with a noid lite,and all check out fine. I'm having a hell of a time getting to the core of the problem here.If by chance you come across a solution to this madness,I sure would appreciate if you could shoot me an email to : email@example.com
And I'll be happy to do the same.In the meantime good luck with your truck.