Car

Asked by Dec 31, 2015 at 08:41 PM

Question type: General

My 94 Yukon check gages light comes on the truck
will run fine for a while then it will start a slight
hesitation so I have to  step on the gas harder to
stop it then the longer i drive the hesitantion gets
worse and I can't go any faster then maybe
30mph..I changed the egr, coolant sensors ,map
Senors,throttle positioning sensors and did a full
tune up..I need help I was thinking maybe the o2
sensors..I also had a trashed convertors so I cut
that off you think o2 went bad ?

1 Answer

71,355

There is a few things to check. Take some carburetor cleaner and spray along the intake manifold gaskets, and around the TBI anywhere there is vacuum, if there is a vacuum leak the RPM will pick up, There is a Air Idle Control sensor on the TBI that should be removed and cleaned along with the port it go's into, that sensor can be tested at Auto-Zone, Must take care in putting it back as there is a major source of vacuum there, Then check the fuel pressure, change the fuel filter first, Pressure should be 9 to 13 lbs. The 02 sensor in those are before the cats, so taking them out shouldn't affect it, not to say it may be bad, Check Auto-Zone to see if they can test that or not .

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