Question about 2002 Buick Rendezvous

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Car stalls, chugs, hard start

I think I got bad gas either water or junk because I never had any trouble then added gas, on an almost empty tank, and the very next day it started to stall, chug and choke. We added dry gas, no good then my husband changed the fuel filter, nothing, then the fuel regulaor and then the fuel pump. It ran better and I drove it to work and it quit again it was hard to start and we had to trailer it home. My son, who is an auto tech was visiting so my son and husband did some diagnositcs and they unplugged the mass air flow censor, the O2 censor and the car did not even miss a beat so they determined that it may be the PCM or brain. We changed that out and it ran fine for a couple of days but today it started chugging and choking it did not stall but it seems to happen at low speed about 20 or so.?? any ideas?? Thanks,

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Change fuel filter add 2 bottles heat tell fix ya bout me ok

Posted on May 23, 2009

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Dear 24scott,

This sounds like it may be as simple as cleaning the water or gunk out of the gas tank which is what I always do 1st because it's easy and inexpensive.

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Dear jmarushi,

This sounds like it may be as simple as cleaning the water or gunk out of the gas tank which is what I always do 1st because it's easy and inexpensive.

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Fill the tank with High Test, Add some dry gas and a good fuel system cleaner or 2 or 3 and this should dissolve all the gunk and clean the injectors! Read & follow the cans' instruction carefully.

If this cures the problem never let your gas tank get below 1/4 and especially never run it to empty as this is when the gunk and/or water will enter the system!

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