2001 Isuzu Rodeo has very little acceleration when I step on the gas. Drags for a few seconds and then starts going. Just changed the alternator and battery last week and this started after.

Check your air filter, although at the rate this is worsening, i doubt if it's that. Probably you should change spark plugs and wires, for one thing. Check the ignition timing, or have someone check it for you. If not that, it could be poor ignition coil, or your EGR, or a vacuum leak somewhere. With the engine running, look all over under the hood, and wiggle every hose you can, and listen for a hissing sound. A lenght of fuel hose held to your ear will help you if you don't have a stethoscope. It puzzles me that this happened right after you changed hte battery and alternator. Make sure everything is hooked up, and there is nothing you may have pulled off or bumped when you were changing them.
Keep me posted. I am hoping this isn't your fuel pump, because that is the worst job. Check your air filter, although at the rate this is worsening, i doubt if it's that. Probably you should change spark plugs and wires, for one thing. Check the ignition timing, or have someone check it for you. If not that, it could be poor ignition coil, or your EGR, or a vacuum leak somewhere. With the engine running, look all over under the hood, and wiggle every hose you can, and listen for a hissing sound. A lenght of fuel hose held to your ear will help you if you don't have a stethoscope. It puzzles me that this happened right after you changed hte battery and alternator. Make sure everything is hooked up, and there is nothing you may have pulled off or bumped when you were changing them. Keep me posted. I am hoping this isn't your fuel pump, because that is the worst job.

Call around to some auto wreckers and get one. Save you a bunch of money, even if it's 500 miles away. They do ship. Call around to some auto wreckers and get one. Save you a bunch of money, even if it's 500 miles away. They do ship.