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If your car is cranking/turning over slowly and then stops.. or struggles to turn over, suspect either the battery or the leads - particularly the black earth lead where it connects to the engine block/bodywork.
Check the leads for corrosion/breakage and tightness. Where the black earth lead connects to the engine block/bodywork - slightly loosen the retaining bolt and then retighten it - create a 'good earth' (and bear in mind that if you disconnect your battery you'll probably lose the radio code and will have to re-enter the code..). Then try starting it.
If it's still slow or sluggish/struggling to crank, then if you can, get a friend or neighbour to try and boost-start your car using booster cables. If your car starts - suspect a failing/discharged battery .. depending on whether the car is able to restart on your battery afterwards.
If your engine spins - cranks - but doesn't start then you have to suspect a faulty sensor. The usual culprits are the crankshaft or camshaft sensor .. or an ignition pack (coil). However, as you say you have a spark at the plugs it's unlikely to be an ignition pack/coil at fault.
Do you know anybody with an OBD .. a hand held diagnostic reader? It only takes a couple of minutes to do a diagnostic check and get error codes - if any. An identified error code will tell you what the fault is.. i.e crankshaft sensor or whatever..
If your battery is okay - check the wiring on the starter motor
Disconnect the battery and let the computer reset. Do the issues go away? If so, then it is related to something that the computer is learning during driving. Narrowing that down can take a LONG time, even for a certified automobile technician.
have the alternator checked for proper output.
Autozone will do it for free if you take the alternator off and take it to the store.
you were running the car on the battery until it drained all the power out of it.
have you replaced your O2 censor yet? or changed your air filter lately. I know our avenger is pretty picky we had a dirty air filter once and it seemed like the O2 censor went out because it kept trying to shut off when the idle was lower. a new air filter did a bit for it then we got a censor reader that you plug into the brain box of the car or the cigarette lighter and it told us the O2 was out and our car was doing the low idle thing. after we fixed it no problems.
Linda to be honest with you I was so tired of this situation that in August 08, 2008 I trade the car and now I had brand new Dodge Ram, Im spending a lot of money in gas, but I like to be safe in the road.