Check the cable plug and rpm sensor on the harmonic balancer
Not enough oil.
its located in the tank. you need to drop the tank in order to get to it as it comes out from the top.
you have to drop the oil pan on the TRANSMISSION, and you can't miss it, it will be right on the other side.
Could be a faulty guage, check to see if you are getting a good connection to it, and with a test light check to see if the current is continuous. If so, then probably the float inside the gas tank on the fuel assembly.... have to drop the tank to do that one. Good luck.
Check the alternator.
Low coolant level which causes an air pocket in the engine.
it could be a number of reasons it could be a bad cam your oil pump could be broken or it might be one of your lifters
go have your alternator tested. when they start to go out the alternator will create alot of drag on the engine but then work fine and the engine wont have the drag but the alternator wont put out the correct amount of amperage and the votage will drop increasingly
its all 1 unit on the top of the gas tank pump and gas gauge costs about 240 at NAPA just prop up the gas tank, loosen the bands and drop it down an easy fix
No, a spoiler for a 2004 Dodge Intrepid will not drop the gas mileage.
Use a delta-p gauge
It's probably the sending unit (in the tank) malfunctioning. Drop the tank to replace it or just fill up every couple of hundred miles.