Have a 2002 chevy avalanche..when at idle or slow acceleration..there is a jingling sound from under the truck..if you let off the accelerator the sound stops. i have heard other chevy truck models ie. silverados and tahoes with the same sound...looked under the truck and have no idea...any ideas?

SOURCE: Squealing noise Upon slow acceleration

First I would check your fan belt, check to see if it is loose by pushing down on the the belt, should only be a slight movement. Look at the belt to see if it i shine if it is belt should be replaced. You can buy a can og belt dress, just spray on to belt on then see if you still get the noise. if you don't then you know for sure that its the belt. Keep us info about how this works,

Cheers

SOURCE: When I accelerate I lose power and the truck turns off

your vehicle is supposed to charge at a rate of 14.4 volts. your volts should never be below 13 while running otherwise alternator is probably bad. If the fuel filter has never been changed it too can cause vehicle struggle to accelerate go dead easily because it is struggling to get gas. I had a 99 tahoe that wouldnt shift out of first when fully accelerating until I let off gas. thought at first trans problems but an eight dollar filter fixed it. just remember that your volts should never go below 12 volts when off, especially when running because it takes 12 v to keep engine computer and all electrical on.

SOURCE: Engine Knocking/Ticking

This may not be your problem, but recently we had chevy in with a ticking on acceleration that turned out to be a leak on the right hand exhaust manifold only slight but enough to make a noise when driven hard. we noticed a carbon mark around the second cylinder in. If it is a petrol engine have you checked the spark plugs are correctly torqued?

SOURCE: 1986 chevrolet silverado truck engine hesitates when accelarating

Along with the vacuume leaks I would check the carb. The accelerator pump might be out of adjustment or something else in the carb. Currently I have the same problem with mine and I just adjusted it and for 1 day so far it's ran fine but I have a holley on mine. Carb may be dirty also.

SOURCE: transfer case clunk 2000 chevy silverado 1500 4x4

One thing to check, which is often the culprit in these situations is the U-joints. With the truck off, crawl under the vehicle and grab hold of the shaft leading into as well as the shaft going out of your transfer case, If htere is a lot of "slop in it, chance are it is in need of repair. Also I would check the oil level in the transfer case, in an attempt not to challenge you intelligence, there should be a plug located in the lower part about 2 inches from the bottom or so. it usually has a square hole that a 1/2" ratchet fits into. Pull the plug, and stick your pinky into the hole, you should be able to feel the lubricant just below the hole, if not it is in dire need of a filling. also check for metallic remnants in the fluid. this is a sign that things are not as they should be. In that case contact a repairman for a more thorough look.