this problem is really mind boggling. well my rex started tobog down on me when i gave it gas and then it finally died. so i replaced the fuel filter and it cranked right up for about a week it was fine. then it started doing it again. so ireplaced the fuel filter again thinking that i have crud build up. well that didnt work. my car turns over but wont start up. i have replaced the dizzy cap, starter, ignitor, . and i know my main relay still works cause i hear it click when i tur=n the key and hear my fuel pump go on. PLEASE HELP!! I HAVE NOT THE SLIGHTEST CLUE WHY MY CAR WONT START. its a hf D15B6

 

An engine needs fuel and spark to run. You said that you hear the fuel pump and that you replaced the cap, starter and ignitor, but are you actually getting either?

To test for fuel, unplug a fuel line after the fuel pump and have a friend turn the key to the ignition position. This should kick out a little gas.(Be careful, don't let your car blow up)

To test for spark, pull a plug wire and plug. Hold the spark plug threads against the valve cover or other metal. Have a friend try to start the car in small increments. You should see a spark in the gap of the plug.