Hey guys,<br><br>Got in the truck this morning and started her up. I was sitting there talking on the radio to work and I thought the truck was idling differently so I look at the tach, and I see it flucuating up and down about 50-100 rpms or so, contstant. <br><br>The truck seemed to run fine, plenty of power etc, but when I would get to a light it would still go up and down on the rpm's. After about 3-4 minutes of driving the truck, it stopped and was rock steady the rest of the way to work. <br><br>I don't know if any of you have seen something like this before, but I'm curious if you have.

 

[quote author=BigBlue link=board=4;threadid=16080;start=0#151247 date=1056057410]<br>Did you put a cam in that thing without telling us? <br>[/quote]<br><br>hehe, no. I've chilled out on the bombing for a while. I have some other things I need to spend my money on, so I've taken a &quot;leave of absence&quot; so to speak. ;D

 

[quote author=1dslram link=board=4;threadid=16080;start=0#152012 date=1056288577]<br>In the cooler weather the heaters cycle causing the idle to drop when the heaters are on and then raise backup when they turn off.<br>Bruce<br>[/quote]<br><br>Yep, mine does that in the winter. This is definately not the heater. This is much faster than that. It hasn't done it since the other day though, so it could have been some air in fuel or something.

 

Never thought about the crank sensor guys, but maybe that's something I need to check. Never saw this problem until I put the new pump on last week. So far, the truck is running fine once accelerating, and it doesn't last long, only for a minute or two when I first start the truck in the morning, then it's solid the rest of the day.