I already tried varying the spark plugs but the new spark plugs never fixed the problem.
Answers: could be..could also be feul injector plugged up..fruitless feul line...possibly ot some bad gas...might enjoy moisture in your gas cistern (not uncommon contained by older cars)..try some dry gas (stp)..could be bleak timing or timing belt/chain...once in a while i use giant octane just to assistance clean out the system (they read out it works)..change your nouns filter..check your distributor cap and check your spark plug wires ...some times the carbon inside breaks down...you might also enjoy a vacuum leak..biddable luck..beam me up mr. andretti
Probably not the fuel pump.
Did you also check the wires,sou`wester, and rotor?
How's the coil pack?
More info would help.
rumbles is a sort term when dealin beside engines....... could be internal engine knock, could be exhaust leak, could be lifters sticking, could be percperation contained by engine....... get it checked..........
Man,,,it could be so frequent things I don't know where to start.However,I don't feel it's the fuel pump.It could be dirty injectors though.Try some injector cleaner.You a short time ago add it to the fuel.You may own to do this more than once.Did you replace the wires as well?These could be desperate.To determine if it's a plug or wire You can verbs each rope off of the plug while the engine is running.Use some mode of insulated tool.Pull them off and next replace them,one at a time,listening for a translate in the bearing the motor runs.If it changes, the module is good.If it doesn't adaptation you found a problem.Also,I would check the distributor cap and rotor button.If these hold not been replaced you could try that.These are inexpensive parts.It could also be a clogged catylitic converter.This is part of a set of your exhaust system.Or the co2 sensors,,,or any number of other electrical sensors or a vacuum leak or ect,,ect,,,ect. Good luck.
YOU SHOULD GET THE VEHICLES COMPUTER SCANNED AND CHECK FOR ANY PROBLEMS AS WELL AS CODES AND THEN YOU WILL HAVE A GOOD IDEA ON WHAT THE PROBLEM TRULY IS.
TRY FINDING AN INDEPENDENT SHOP INSTEAD OF THE DEALER OR A CHAIN STORE BECAUSE YOU WILL BE OVERALL MORE PLEASED WITH THE FINDINGS AND THE SERVICE.
LEAVE IT THERE WITH THEM SO THAT THEY CAN FIND THE PROBLEM FOR YOU, IT WILL BE A LOT BETTER THAN JUST REPLACING PART AFTER PART AND NOT DOING ANY GOOD.
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