truck runs rough when it warms up

Asked by Mar 22, 2016 at 06:03 PM about the 2004 Ford F-150 XLT SuperCrew

Question type: Maintenance & Repair

i have a 2004 f150 with a 4.6 engine . the truck runs fine when i first start it but
once it warms up it start to sputter  when i give it the gas. the engine light is on
but not blinking. any suggestions?

2 Answers

16,580

IAC, dirty throttle body, bad spark plug(s), spark plug wires, etc. You have to begin a process of elimination. First, get the code read from a place like autozone. It would lead you into a direction.

5,605

Hate to break it to u but u have phaser issues. It's a system that is used to automatically adjust timing on each camshaft and they work with oil pressure. When cold the oil viscocity is good as it worms up, oil viscosity drops and oil pressure drops below 25psi and phasers can't do their thing. Check oil pressure with a pressure gauge

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