4.3L engine, travelling highway at 100km/h, approached a hill and when depressed gas pedal RPM's went to 3000 or better but lost power, speed reduced immediately to 90 and started to drop lower. Released gas pedal and everything seemed okay until tried again and same problem. Could continue on as long as I didn't push the engine, Replaced air filter 3 weeks ago, fuel filter and tune-up maybe 2 years ago, regular oil changes, and new fuel pump about 16 months ago, also fuel pump was always loud but seems to be louder recently.
Have fuel pressure checked if ok should be approx 60psi.if ok try disconnecting mass air flow sensor connector to see if problem is eliminated. this the computer in to a default mode.the sensor is a common problem.thanks from schleck
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the catalytic converter most likely is no the sorurce of the problem, older design bead type Cat converters used to plug, but it is very rare on the newer ceramic honeycomb cats, u need to have the electronic engine control tested, are u getting a check engije light? if not has the fuel filter been replaced every 30,000 miles? also a part called the Mass Airflow sensor can cause these symptoms as well as igntion system problems.
This can be Caused by Both the Fuel Pump and the Fuel Filter. If you have not Changed the Fuel Filter in a While, Try that First and see if it Helps Before going to the Fuel Pump. It is Easier and Cheaper that the Fuel Pump to Replace. Please Rate my Response, I need all the Help That I can Get! Thanks!
the service engine light means one of the sensors are bad or the idle control or even the throttle position sensor , these will cause your symptoms
you will need to check the code which will tell you exactly what has went bad and needs to be replaced
hope this info is worth a fixya , since everything else hurts our scoring , and if you need any more help I'll be glad to help