My1994 F150 4.9 six sound like if only5 cylinder works. and runs whith a little less of power. the fuel pressure is ok and the sparks was no problem.Any suggestion or idea?

 

What is your actual fuel pressure, and how exactly did you test the ignition system? Have you tested compression? Is there any noise from the side cover? Have you tested your oil pressure (NOT using the dash gauge)?

 

Thank you for worry Steve 83. My truck has CNG (I live in Argentina) and when the engine is running in CNG works OK, thats because I say the sparks are fine. My fuel pressure is 3.2 bar, and I did not another test. I think in a inyector fail or something in the inyecction system. Thank again and sorry but this is my best English.