20 Most Recent 2009 Chevrolet Avalanche - Page 8 Questions & Answers

All the time or when you step on the brakes? If so you need new brakes and possibly other things.

Not knowing the age- I will say that back in the days of carbs- there was a solenoid which increase the idle speed when the AC was turned on. This is done by the computer in a modern car, so your computer is not being told to raise the idle speed with the AC on. You may have an error code for this. either way looks like dealership to fix this one.

sounds like a bad transmission.

Jack up car put on jackstands with wheels off of the ground. check for bad tie rod ends or any looseness in front end parts if you dont know what to look for most sears service centers will check it for free. ( make sure of cost by asking first) if no problem is found in front end I would suspect a worn steering gear box. if this was helpful please leave good feedback. Please check it soon it could be a very dangerous problem that may cause loss of steering or rollover.

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Probably

Replace the T.P.S. sensor." throttle position sensor"

2005 Chevy Avalanche.And you did the Throttle body sensor. Reduce power light coming on, APP and TPS that a shot in the dark, As for the EGR if that is a problem The vehicle is a speed density it also uses a MAF (mass air flow) . Whenever that light comes on I'm finding it in the transmission parameter not the TPS or APP (accelerator pedal position) first the 2005 Transmission has a high failure record, There is a transmission pressure control solenoid that is given wrong input data and send the transmission to self destruct. If this is your second problem similar to last year go ahead put a throttle body sensor, but the APP need to be in sequence with it. As for the EGR no it wont cause sluggish failure it is monitored by the MAF if the MAF fails then its back up by the MAP. For the reduced power light get the ECM reflashed