Going down the road runs great then starts loosing charge sit awhile and push off runs great. put new altenater on it i can reve motor up if running lights and starts running good

If you have any rubber fuel lines in the fuel system, I would replace them. Over a period of time the insides of the hoses swell up and stop the fuel flow to the engine.

Check the small wires coming off the altenater. Once the engine starts, the car get's power from the altenater. These wires are bad about breaking into, (on all vehicles) but the insulation stays unbroken. The wire makes contact enough to run, but the feul pump gets hot and shuts down. Or the wire looses contact and shorts out. check the wires for a limp, week section and splice where broken.

HAVE YOU REPLACED THE FUEL FILTER. A dirty filter can let enough through for a while then the motor dies. After sitting for a while their is enough residual pressure in the system to force some more fuel through. Col

Replace coil

It sounds like your ignition coil is overheating. Once it cools down it will fire properly until it gets hot again. Replace the ignition coil and you should be all set.

Did the battery go bad or down? Batteries fail if their overcharged, not charged, or dragged down from sitting with a draw on them. The altenater may not work correctly as a fuse may be blown. The big power wire on the back of the altenater is hot all the time the battery is connected. Make sure that it is. The plug that plugs into the altenator one wire hot all the time and the other is on with the key if itdoes'nt do that your on the serch to do that. with a volt OHM meter you can tell if it's charging 14.5 volts running and 12.6 volts sitting with the key off. if the battery is below 10 volts the altanator may be a good one but it's smart enough to not to try to charge a dead battery so it won't turn on. The liklyhood of the battery being bad even with it new is possible so don't rule that out.

Probably the fuel pump, or a plugged fuel filter. Also may be the Catalytic Convertor plugging. Will need to be diagnosed further. Hope this helps.

The float in the carb is sticking..Buy a can of carb clean and spray it down as good as you can..In every hole and what you can get to...Alot of times this will work without having to take it off and clean it..After you spray it down really good let it sit for about 20 min.That will give it enough time to break down theat old gummy gas build up..After letting it sit Start it up..You may have to hold the gas pedal to the floor in order to start it because of the over satutration of the cleaner..After letting it run for awhile let it idle and go under the hood with it still idling and rev the motor up and closing the choke at the same time..You may have to rev it up a little high..When you rev it up and the motor is racing quick close the choke and the motor will start to die down and rev it a little with the choke on..What this does is by closing the choke when its reving up is it sucks all that crud build up out .You may have to do that a few times but it works great..Good Luck and Have a great day

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fuel pump probally needs to be changed. also run some fuel injector cleaner threw her.

Hi. I have two Dynasty LE cars, (a 91 and a 93). Both have the 3.3 litre. The 1991 had almost the same problem as yours except it would only do it once the engine warmed up, (similar to your freeway issue, given distance and time for the engine to warm up to operating temp.) I had it in about three shops before the dealer found an intermittent fault with the cam and crank sensors. I replaced them and now it runs just fine. I hope this helps.