Between 1500 and 1900 the RPM's fluctuate even though throttle is in one position. It seems to do this worse when the engine is cold and it is cold outside. Any suggestions would be nice thank you, this problem is occurring on my 5 speed

 

The RPM's and other gauges are slightly affected when the intake heater is cycling. Nothing to worry about.

 

No its not that, there is like a dead spot in the throttle then you push the pedal a little further and it gets past it and its fine. Its just weird and hard to explain.

 

look at or monitor your tp sensor, even with engine off slowly depress throttle to the floor and back and see if tp ramps up/down smoothly.

 

pull codes! if APPS it should code (or worse you have a bad/failing vp)

 

APPS would be my guess.... Check codes....

 

Thanks for the info going to check for codes this morning

 

Not getting any codes out of it used the smarty and the three turns of the key and nothing

 

have you tried reseting the apps?

 

No not yet cant find the steps involve in doing that, maybe someone will chime in with those.

 

APPS Reset << click link

try this

 

my first lift pump failure had those symptoms, like a bad accelerator pump on an older gasoline engine

 

lift pump was changed about 40,000 miles ago. It has good power haven't installed my new gauges yet adding fp gauge