Bad idle= fixed

[Jimmy]

My truck has been stupid lately.Idle all over the place,pissing me off.Dieing,gotta keep my foot on the throttle to keep it running. :roll:
What got me though is my 20" of vacuum @ idle when first started..Newish silicone lines from Ian so I know that ain't the prob. Reset my IAC and the ECM.Still hunting.WTF? Ignition parts are great.

Did some hardcore searching today and found the prob. :doh: Turns out that the big port that has to be bypassed on the back of the TB had a cracked rubber blockoff on it.This is the port right next to the TPS sensor.I put a new blockoff on it and problem solved.Hopefully this info will help a brotha with this prob out.

 

[bezerk]

Re: Bad idle= fixed

did that crack not affected your vacuum?.
nice find though

 

[alwayscode390]

Re: Bad idle= fixed

My truck's idle is sorta choppy ... like 200rpm fluctuation up and down....is this because of the stock cam or should I be checking for vacuum problems? When I first start it and put it into reverse it is SOOOO close to dying, but redeems itself without me having to apply gas....are these normal SY traits?! Thanks ---