Engine wont start!

Engine Mechanical problem
1999 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic

After sitting overnight our gt won't start. We had to buy a brand new battery thinking the old one was bad, apparently we were wrong. We put the brand new battery in it and after a week the problems started again. My husband goes to start it to go to work and nothing. What can be wrong with our car?

It does it while im driving no matter if im driving in town or on the highway or even the interstate, it mostly does it when I go up hill but it will also do it while im driving on a flat straight road. It also does it when I accelerate to, it doesnt consistantly do it but it will do it a couple of times while im driving, I changed all the fluids but it still does it.

Can any one help me with this?

The check engine light is on and the last tune up was 3 months ago.

It doesnt shake while idling.

I drove the car yesterday it did fine no wierd stuff came outside today started it and there was a grinding noise and the lights to the radio and ful mileage wasent on so I turned the heater n and the lights came on then the car died and now when I turn the keys it clicks and lights go off even with a jumper hooked to it and there is oil at the bottom of motor on the a arms

Oil level is low but was fine yesterday I wonder if starter could be broke? But if so why would it be grinding while its running then die when I turn the air on?

Other Category problem
1999 Pontiac Grand Prix V6 Front Wheel Drive Automatic 160000 miles

it is the coldest its been outside since ive purchased my car (about 5 months ago). It was running complete fine, untill I tried to start it after having it parked and turned off for about 20 minutes. It simply wouldn't start. The radio, heater and everything worked fine but it just wouldnt engage. Someone's dad helped me, and he kept revving the engine untill he heard it "clear up." I then drove about 10 or 15 miles with no problems. When I tried to start it again, it did the same thing but I couldnt get it to start by giving it gas. I bought a bottle of heet to put in since it is extrmely cold here, and I let it set over night. I turned my car on the next day, and let it sit for about 3 minutes. The rpm needle was shaking a little from about 100 to 120 in the idle mode. The car was shaking a little and didn't sound right. Eventually, the check engine light came on and it shut off. It hasnt been able to start since. Please help!

Have somene check the crank sensor. This happened to my 1999 Pontiac Grand Prix GT with 42000 on it, since then its been perfect. Now my car has 115000 and it. Hopefully this will help ya

The car cranks but would not start. The fuel gauge registers a full tank of gas but shortly before the car stalled, the gauge was at half-tank. The fuel pump activates, but only if it is jumped. There is power going to the ecm and from the ecm

There is spark and the injectors are giving a pulse, the coils were changed.

Did a scan on my 1999 grand prix 3.8l and po300 code came up, says random/multiple cylinder missfire detected. Where do I start/ check first.

New fuel pump pressure good, new fuel pump regulator, spark good. Refernce volt good at map sensor. By all accounts vehicle should start. 12 volts at injector when key turned on. Checked injectors before installing this set. Car caught on fire 1 year ago replaced harness and replaced fuse box. Scratching my head over this one.

Placed key in ignition and it will turn only so far but will not start car. When trying to remove key it will turn back only so far and will not release, it stays stuck in ignition and battery power has been turned off for the entire car. This has been going on for the last couple of weeks. In the past I could play the key back and forth and it would work and allow the car to start. Another time I banged on the steering wheel and jarred it and the key would turn to crank car, even slamming the door has produced the key to turn. Now the key is stuck and will not release from ignition. I tried using the spare key in an earlier incident and it had the same results, would not crank car. I suspect the ignition switch has gone bad. Does anyone know of a fix for this problem shot of having switch replaced? This car is not worth sinking a lot of money into due to age and mileage.