2008 Chevrolet Uplander Questions

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Wat can it be. Some ppl say it's my oxygen sensor and sum say its my fuel ejector.

Amount to replace

because it was mis firing going up hills the engine light came on after 65 miles then I installed new coil this seamed to work but then after driving on highway miles after 250 miles engine light came back on I then coded it again always P1174 I took the light out and then drove 36 miles it came back on again when light comes on I seem to get mis firing when I put on the gas till it levels out some one told me to replace a Injector or ejectores I think it may be a o2 sensor can any one help this only has 36000 miles on it and I have owned it for about 4 months it runs very good at times even with the light on then other times mis firing after light comes on

and the coil it seemed to help but did not totally I drove 250 miles before it misfired and light came on then I did the reading again it showed P1174 trim fuel cylinder each time I drove another 65 miles and light came back on with a slight mis firing when I give it gas but then mis fire stopps after I level out around 65 miles per hour

vin number 1GNDV33148D108142

Then other time it works like it is suppose to

TC light on control panel

Diagnostic test said pcm power control module sensor

no key fob. must use key for entry via drivers' door. liftgate won't unlock. went thru owners manual. van not equipped with upgrade comp. have LS model , long w/b.

I've changed the sensor power steering pump gas cap. Light is still on.

Why this light is keep on coming frequently and stay permanently. " check ABS monitor system, Stability system and Traction system. I just fix the transmission, change water tank and pump last year around September. Also there is this smell like burning steel just recently

After that I've changed a new mass air flow sensor and start the engine the still on. I would to know do I need to test drive after I replace it.

Took to mechanic and said it showed a code that said it was a roof rail sensor. Where is that located and how do I change it.

down before it will start again, repeats itself in that manner
We have taken it to many mechanics and they cannot find problem we need help

This started earlier last year. It hapens very seldom. Almost always is wet weather. When the engin stops you get no warning lights or anything. You cost to a stop and try restarting it. When it restarts it shaks and runs really rough, Pushing the accerator down allows you to drive. However very slowly. Only 5-10 mph. Speed picks up but only with high RPM. Then as quickly as it started it's good again.
This is a scary thing. The engin failure can happen at low speeds or high speeds. You have to get off the road very quickly. Auto Zone and my mec have been unable to find the problem. Help