2001 GMC Safari AWD.
SES light Code P0300, or P0301,  sometimes a P0341.
Repairs for this problem -new engine   new following:   crank sensor, cam sensor,
distributor(3Xs) plugs, wires, coolant sensor, aim sensor, tbs sensor, knock sensor.
Cap and rotor.
Question = the engine will not stay lit, after it warms up.  When cold, it runs fine, but
after a couple mins. It will stall at idle.   Dealership tech claimed that it was a bad
distributor, and that it was out of time.  So he opened the hold down and turned the
unit.  Said it was in time, but it ran a lot worse....missed and bucked all the way
home....  So i bought a new distributor, and its back to running good at higher than
idle speed, but will stall out as soon as i let go of the gas pedal.( when warmed up)   
have changed all the sensors, plugs and wires to no avail.  The tech claimed that the
engine was learning, but it did no good.  We checked for vacuum leaks with either,
but found none. ( a mechanic helped me with this)   any ideas?    The codes are 300,
301, only one time did i get a 1345.   But i think i pulled something to do that.    i
changed out the no. one wires to see if it made a difference, but it doesn't.the spark
is fine.    Help.
Answer: The P0341 and P1345 mat be because the distributor
is not in the exact proper location. P1345 is crank and cam
sensor not synchronized.
The misfire on cylinder code P0301 should not cause the
engine to stall, the timing codes would. Going to need to play
with the distributor a little. Replacement may have fixed the
original problem, but since the timing is off, it acts the same. Or,
the engine timing is off- loose chain, etc- If the engine is used
with a lot of miles.
2007 GMC Sierra 6.6L.
Warning lights = check engine light.
Repairs for this problem = 5 GM dealers with no solution.
Question = im only getting 15 mpg and i want to know why im not getting any better fuel mileage.
Answer: That's actually pretty good mileage for a big truck like
yours. Diesel engines aren't known for getting good mileage,
especially just doing around town driving or towing. Some things
that can adversely affect fuel mileage would be a clogged or
dirty air filter, a clogged fuel filter, bad gas, burning oil, or just a
poor running engine. Not knowing how many miles you have on
the truck, I can't say what might be going wrong. If you've kept
on maintenance, and everything seems to run fine, that's
probably the mileage you're going to have to live with. You do
mention the check engine light is on, which could pose a
problem depending on what the issue is. A dealership should
be able to at least fix that part of the problem, after pulling the
code from the computer and diagnosing that problem.
1993 GMC 1500 p/u
Repairs for this problem = Changed right front caliper
Question = I have a 1993 GMC sierra p/u. The front right brake will not release after the brakes are
applied. I can bleed the caliper and it releases. When the brakes are applied again it still will not release.
I changed the caliper and the problem continues.
Answers: The caliper isn't the problem on your vehicle. You
have a bad brake hose. The rubber flex hose that goes in
between the steel line and the caliper will deteriorate over the
years and get soft inside. This will result in the hose actually
closing up after the brakes are applied and not letting the brake
fluid release from the caliper after the brake pedal is released. I
would recommend replacing both front hoses as a pair if you do
the job, as you can bet the other side is going to go bad soon as
well. Replace the hoses and then bleed the brakes and you will
be good to go.