Question: I have a 2003 Hummer H2.At between 45 and 50 mph I get a bucking as though the Trans is looking for a gear to go into.Teh dealer has checked the Trany and found nothing.They say that it is not the air flow sensor and they have no idea what it could be.The Hummer is still there waiteing to be fixed.Do you have any Idea what it could be.Also my milage has gone down to 9 mpg from 12mpg.The dealer is stumpped,and so am I.

Answer: Thanks for the question Greg
I have two questions. How many miles on the vehicle and were any trouble codes found in memory?
Over 40 mph the transmission converter has a lockup mode that connects the engine and trans with no slipage. This will cause any misfire to jerk or buck the whole vehicle. Worn ignition parts or dirty injectors could be the cause. Did not
find any information on "IDENTIFIX" or "ALLDATA" relating to this problem.
Thanks again

Question: I have a 99 chevy blazer. I replaced the fuel pump after doing several test on the filter, fuse and relay. I could not hear the pump running so we replaced it. The car started just fine and ran great. One mile down the road the gas gage stopped working. I didnt think anything of this. Then Seven miles later it left me stranded again. I thought that I just was unlucky and replaced the pump again. Once again the car started and ran just great. Seven miles down the road the gas gage stopped working again. I dont know what else it could be. Please help me know what is going wrong.

Answer: Thank you for the question. We have experienced this problem before. If
the complete fuel pump/sender asembly was not
replaced as a unit. The connectors and/or wiring inside could be at fault.
Another problem could be the connector to the sender or the ground. For the
problem to affect both the fuel gauge and pump, the ground should be tested.
Testing from the sender (black wire) to a known good ground should be no
more than .002 ohms. If you would like us to test this please call for an
appointment. Thank again..

Question: I have a 1995 ford mustang 3.8 liter v6 with 94,000 miles it has flowmaster exhaust, bbk cold air intake, msd spark plug wires, and bbk underdrive pullies and it has an overheating problem when I have heat after the car warms up the engine is not overheating but after about 3-5 mins of having heat it goes away and my engine starts to get really hot I have gone through thermostats and i have flushed the radiator im not sure what it could be the block is not cracked because i just changed the oil and it is not milky any help would be awesome thank you so much

Answer: Kris, thank you for your question.

It sounds like you have cylinder head gaskets that are leaking, you should have that tested, they make a block tester kit or you can test for hydro carbons in the radiator using a carbon monoxide tester.

As this is an expensive repair, be sure to have it diagnoised properly at a certified shop first.

Thanks again for your quesiton.