Why doesn't a Nissan truck run smooth in overdrive?

Can you help me with my truck problem (93 Nissan starting issues)?

• this problem is baffling me! Im getting very desperate now so i hope someone can help me. heres the info: My light pickup truck (93 nissan) starts up fine in the morning when i go to work. (i deliver in it) but as soon as i turn it off and try to start it back up again it wont start. i dont really hear firing either. so usually i try to push start it and it fires up. when it does i can smell that the engine was flooded (heavy gas smell) but it does start running again. but if i were to turn the truck off i wouldnt be able to start it. i would just hear the starter motor going and no firing. now if let the truck sit for a few hours i (maybe) can start it up using the starter. and i have no idea why any of this is happening. it doesnt make sense to me. why does the truck start in the morning. but not start 10 minutes later. why does it not start 10 minutes later but then can be push started? i have brand new gas in it. brand new plugs. also occasionally on days when i get it started up sometimes around second gear it sputters bad like its only firing on 3 cyl. it goes away once i give it some gas. then sometimes never comes back that day. winter is coming and i need this truck to work so bad. i cant even buy new tires for it. because i dont want to waste the money and once i turn the truck off at the tire place it will be stuck there. please help. thanks.

• Answer:

  You can get your battery, starter and alternator tested for free at http://www.autozone.com/in_our_stores/free_testing.htm I would first make sure all of the connections at the battery are cleaned and making good contact, don't forget the ground connections! Next get the battery, starter and alternator checked. If you can start it by rolling it, you have bypassed the starter and battery. Check or change the E.C.C.S. Relay (here is one from a maxima) http://autorepair.about.com/library/images/bl369a-lib.htm if you have another relay just like it in the fuse/relay box, swap them around! Another possible cause, the computer Routine maintenance should be up tp to date especially new fuel filter, air filter if needed.Check or replace the distributor cap, rotor and ignition wires.