i have a 1998 4.6 f150 with 150000. The engine has a slight miss. I have replaced the coils, sparkplugs (motorcraft), injectors, and O2 sensors. I have also cleaned the upper intake and MAF sensor. does anyone have any ideas im getting really tired of this and im tired of spending money for nothing

 

Go to auto zone, ask them to read fail codes in your computer. Even if your check engine light is not lit, your computer still records what cylinder is misfiring.

 

A good compression test/leakdown test may be in order. This will indicate if your miss is electronic or mechanical -- ie rings, valves, gaskets, etc. I know we all wish these things would last forever, but it's just a bunch of parts. Sometimes you get one that goes bad.
Denis.