Question for the brain trust; 2004 1500 4.7 with a 5 speed, start is normal, normal idle speed. Start moving and push in the clutch, it will idle around 1500 until I come to a stop and then Idles down to normal. Seems like the faster I go, 4-5 gear and push in the clutch it will idle around 2500-3000, as I slow, in natural, rpm follows MPH, until I come to a complete stop then it idles normally. I did notice a couple of times, around 30-50 mph, with the clutch pushed in, RPM would drop to about 1500 and then come back up. Any help would be greatly appreciated.

 

Does your gas pedal connect to the throttle via a cable? Or is it drive by wire?

 

Every 4.7 prior to 2008 is cable TB.

 

Connects via cable. Cables are good, no slack.

 

Is it sticking??

 

No, I can step on it in neutral and it idles back to normal in a few seconds. So far I’ve changed the idle air control valve, throttle position sensor, cleaned the Mass airflow sensor and cleaned the throttle body.

 

Is this a new problem? Or has it been doing it for a while???? Wonder if this is a programming issue??

 

new problem, not a daily driver, a couple of times this summer had erratic idle with the A/C running, threw a P0507 code "high idle" then it started this about a week ago.

 

Ok, MANY things can cause idle issues..... PCV valve, EGR valve, vacuum leak, failing IAC, etc...... That is gonna be a fun one to find..... Probably need a high-zoot scanner than can manually activate some of those systems.....