car turns over but will not start

Brand new alternator was installed and a new battery the battery still doesn't hold a charge.

have a 1998 Nissan 200SX it has been sitting for just under 2 years, We have decided to use it again. We were told that since there was less than an eighth of a tank of gas it should be ok to put a gas treatment in there and then fill it up. So what we have done so far is change the spark plugs and cords, replace the fuel filter, bought a new battery, and put some heet in the gas tank along with something lucas brand to help clean the injectors and think out the gunk in the tank.. But the car won't start it just keeps turning over, We used some starter fluid and it started but only for a few seconds and then turned off. What else should we check for??

I have a 2005 Gmc canyon that keeps losing power and i don't know when it's going to do it.I have a son to protect and we were almost hit as my truck lost it's power in a blind hill yesterday on the way to their school!Thank God the car swerved out of the road & everyone was alright.This was a wake up call!I have already paid out hundreds of dollars on having it put on a machine & being told it was the throttle body,so i had it replaced & thought it was fixed til it started with the same thing happening again which is 2 lights come on saying reduced power and traction default-idles badly!!-and loses all power,but still runs?I pull over to a safe area then turn it off and on a few times and it's fine.It is getting worse though by doing it a few times before i can get back home.Can anyone please help me?My husband has posted asking what could be wrong,but no luck yet.Anything would help.Thanks

It makes the noise whenit is not accelerated also

Most of the time the guages work; however, periodically, the RPM will stop working. Sometimes the speedometer won't work. Sometimes the battery needle will pulsate and the engine will pulsate with it. Maybe these are two seperate issues, but not sure.

It sounds like the fluid is trying to circulate through the car...mainly when cold. Also, when excellerating from a stop, it feels like you have to push kind of hard on the excellerator peddle to force gas/to get the car to excellerate.

Ok the brake light on the dash where the engine light,oil light etc is has come on and wont go off.I have checked the brake fluid level-good, changed the rear brake lights and still nothing BUT the brake light above the rear window is fine.I tried finding the fuse but couldnt find it bc it doesnt have it listed in the fuse box which one is for the brake lights, so need help guys, thanks

I have looked everywhere no openings

After the car is driven for awhile when coming to a stop it will die. I will put in park and start it with no problem until I try putting in gear and it will die. The gauges (rpm and speedometer)will sometimes stop working. Any suggestions on what is going on...are these two different issues?

causes brake wear

Is there away to turn 4x4 off! Pushing the buttons isn't working !?!?!?!?

Car has 74,000 miles

coolant level is fine...does not do it all the time

2003 BMW 745i - Extended warranty is refusing to pay for cost of replacement. Thanks.
Part #24347588725 Sealing Sleeve