How much does it cost to replace both wheel barrel does the check transactions lite comes one when wheel barrels need replace

My window motor works however i wanna know why it wont roll up or down... If its cauae off track and if so how can i get it on track myself and if its a clip same question and answer please thanks for yiur time

my floor mats are wet.
What could cause this?

I'm about to purchase a 2004 MC w/3.4L engine. Which is the bad one? This one or the 3.8. Dealer is saying 3.4 is a the best (of course), while my personal mechanic is saying that the 3.4L is the worst. Car is for son, looks nice, no radio, a couple of cosmetic problems, asking $2400 - will offer $2000. Is this fair?

The car was shaking when driving beliw 30-40 or at a light we got oil change spark plugs fuel filter ran great! Then all of a sudden its doing the same thing before it shut off well at a light the battery light came on too shut car off turned it back on started right up ut a lil sluggish then it picked up n started making a noise the speed picked up but the noise was only at a 30-40 mph speed noise coming from the back of the engine towards the windshields wipers this car gets oil changes on time replaced the headgaskets spark plugs fuel filer tune up

It started in May 2015 and did it off and on for 4 weeks and then stopped until September 18, 2015. I had work done on the car before each time.

Engine cranks, I can hear the fuel pump cycle, the security light flashes on once but goes out, I've tried disconnecting the battery, checked fuses...I'm at a loss.

The fluid is a pinkish color

Wen it happened the car started to loose power an shut off. I had to put5 quarts of oil but by then a loud knocking noise started. Also was overheating but wouldn't show wen you opened the hood only on the gauge. Please help!!!!