On Mar 22, 9:30 pm, "jsmith93blazer" <jsmith... DeleteThis @gmail.com> wrote:
> I have a 1990 Toyota Pickup. It's been a great truck. In normal
> driveing the truck has always had a studder while going down the road
> at a steady speed. First start of the day, the truck takes a min to
> reach full low idle (have to press peddle to get the low idle most the
> time) <maybe norm. when the truck is at idle with ac running it'll
> idle up and down by it self, you can see the carb open and close a
> bit?? Ok now for what happen and the reasion i ask, truck had a small
> heating problem, took out the t-stat, and took it for a test, running
> the ac to try and make it run hot, it done good. THEN i turned off the
> ac and i was backing out of a driveway and slighty bottemed out(not
> very serious) and from that moment it ran bad. the truck now will only
> idle, or run WOT. reving the engine and holding the peddle steady
> makes the engine rev up then acts like it's being choked and about to
> die and stays that was untill you let go. I'm just puzzled. but i'm
> thinking maybe a air/fuel problem. or somthing to do with running the
> ac. engine and carb was rebuilt maybe 4-5 years ago. fuel pump is from
> autozone. (and i checked the tank and lines their ok.)
It may be, as has been suggested, that the "bottoming out" broke
something loose in the exhaust and you now have a blockage. I'd look
for disintegration within the catalytic converter. They rot out
internally after years of use and a sharp blow might dislodge a bunch
of crud. There is likely a screen at the outlet of the catalytic
converter that could get blocked if enough loose material where
present. Do you notice considerably less exhaust coming out of the
tailpipe? Also, is the exhaust manifold getting both hotter than
normal and getting hotter faster? If so, it sure points to exhaust
blockage. Good luck. Al
>> Stay informed about: 22r Air/fuel? Carb? Pump? BIG, maybe easy problem???HELP!! 
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