For the last few weeks my blazer appears to be guzzling fuel....also the gas gauge is moving up and down more than usual....this morning the blazer started up just fine, then on my way home from work, after a brief stop, in which the engine was off, my blazer would not restart....had to have it towed home...anyone have any idea what it could be?...I am an amateur mechanic and need some advice as to how to proceed from here....I think it could be a fuel pump, not sure though....the tow truck driver said that if you hit the fuel tank with a mallet then it would start the blazer, he went ahead and hit it, and the fuel pump, just a bit ........it started up, but sounds really rough and I don't know if it will start up again without doing that...so now what? Thanks for any helpful advice...

I went to one of those quick oil service places this morning. I like the places for the quick and effecient oil changes, although to me it seems they are always trying to sell you some extra service. So I tend not to believe them with most of them. Today they said there was sludge in my oil and that I needed to pay $70 for a complete oil cleaning/flush. I declined this for the time being, but wanted to know if this is something actually needed now and again. Can you purchase something on your own or must this be done by a shop. Anyone know about this? Car has 95K miles is an Acura RSX (2002) Thanks