Idle unsteady

[Tazman]

My 87 is stock with fuel injection.Once in a while when at idle it will fluctuate a little,enough that the oil gage moves.Any ideas on what this is and how it can be fixed?Thanks

[Lt.Del]

is it when it first starts up cold, or after driving a bit w/ a warm engine?

[VileZambonie]

Check for vacuum leaks and check the tbi base gasket

[1980c10]

Any codes? You could check your idle air control valve. Any other symptoms?

[Irish_Alley]

Also does the volts drop any ?

[Tazman]

It does it when warmed up mostly.Thanks for the ideas I will check those out.

[Irish_Alley]

The reason I asked about the volt is when my 94s alt was going up it would stop charging and the truck would run off the battery causing it to idle erratically

[Tazman]

I will check that,I do not have an alt gage.Thanks