H23Lude9

It started about 2 weeks ago...when im at a stop light or just sitting still while in drive and on the brakes its like my rpms seem to drop and the truck starts to run rough. My rpm gauge doesnt really seem to move but you can just feel it in the truck. It doesnt really happen while im driving just when im starting to slow down or when im at a complete stop. I know i need a new O2 sensor but do you think that will cause it? any help in diagnosing will be great!!!

p.s I drivea a 1996 GMC Sierra

35thcamaross

have you checked all your vacum lines, may have a leak, does it run rough just at idle??

H23Lude9

no the increase in full amount when i start to accelerate seems to over power this "rough shake" and it does fine, just when i am at low RPMs (like slowing down or complete stop) does it start to do it. I know the fuel system has been replaced, everything is brand new so that cant be the problem....not sure about the vacum lines though

35thcamaross

Start your engine and your can spray some soap and water on your line and see if you have any, if you cant and feel like spending alittle money, i know a kramers we hook it up to a machine and put smoke in it to find a look, good luck on the truck, i'll ask my friends at the shop see what they say and get back to you

35thcamaross

if your truck is fuel injected, theres a senser on your intake that controls air/fuel ratio, check the clip and see is that looks damages, if not, only other guess is a vac leak.

H23Lude9

thanks for the info...i need to get a manual for my truck to find all this stuff

willie

yes an o2 senson on an obd2 vehicle will cause it to run like shit it would either be stuck too lean or too rich in your case its too lean and your computer is trying to make up for it and its not working my truck does the same thing and i need an o2

35thcamaross

if it was a o2 sensor wouldnt it be running like shit all the time, this is just at idle

H23Lude9

well i unhooked what i thought was Bank 2 sensor 1 and it hasnt done it since.....so im pretty sure it was the o2

willie

bam bitch dont fuck with the toyota mechinac i know them mother fuckers inside and out oh and i just replaced my o2 and guess what FIXED MY RUNNING PROBLEM dont say things that you dont know about