I have been having a low idle off and on for the past couple weeks. Can drive it and it runs great, get out somewhere and start it back and it has a low idle and a slight bog down low, I can feel it in the brake pedal as well, like a stumble when the idle is low. I have changed the o2s, cleaned the Maf and cleaned the throttle body. I quess I have to pull the plugs and wires and check them. No CEL. Plugs and wires were put in with the longtubes a year ago. They are Accel wires and ACDelco plugs. Any other ideas on what to check. Thinking about going ahead and changing the fuel pump and filter also being that they have 117,000 miles on them.

 

Anyone have any input on what else I should be looking at. I have another Maf sensor, I should probably try that too.

 

have you cleaned your injectors lately?

 

Nope, and I still havent got a chance to pull the plugs. Been working. It hasnt happened in a couple days, thats whats so annoying, its off and on.

 

Is it a new problem, or has it always been that way since the tune? Get a fuel pressure gauge and check the pressure, but I am not sure why it would just be at idle if it was the pump.....

 

It has just started about two maybe three weeks ago. I'm thinking more like the filter than the pump. Its probably just a sensor acting up though.

 

I had similar problems with my truck and it turned out to be a 02 sensor was toast....

 

I swapped the 02 sensors, but one that I put in could be bad. I will check into that.

 

That was exactly what mine did... I bought 2 brand new ones when I built my exhaust... I ran them for roughly 20 miles while getting the tune adjusted.... I had a 02 heater code pop up during that time, but they oscilated/switched like they are supposed to... So I just thought it was cheap header coating.... So I took off the headers and sent them out to be coated... I put the o2s in a ziploc baggy while the headers were out... Get the headers back and truck runs like crap... Took both o2s off and exchanged them under warrantly.... No idle problems now...

 

I had this problem once. was bad gas. Also check your cats... if you have them.