1997 Land Rover Discovery runs ruff over 2500 RPMs

DOES THE ENGINE SPUTTER WHEN YOU JUST REV IT UP WITHOUT THE TRANSMISSION IN GEAR? IS THERE A CERTAIN SPEED THAT THE VEHICLE GETS TO AND THEN THE PROBLEM STARTS?

I did rev it up without trans in gear and it sputerd just a bit, and around 20 or 30 mph is as fast as it would go. The next day I drove it and very little problems.I did however jump on the hwy for a few exits to see what it would do, and as I got of, it acted as if it ran out of gas for just a second sputerd for a bit and that was all the problem I had. After that I was very easy with it, no fast starts and lite on the gas. Fuel pump?Should I try a fuel injector cleaner?I also want to thank you for answering my question! Thanks, Derek

WAS THE FUEL FILTER REPLACED AS PART OF THIS TUNE UP? THE FUEL FILTER IS VISIBLE THROUGH THE RIGHT REAR WHEEL ARCH. YOU MIGHT BE ABLE TO SEE IF IT WAS CHANGED. ALSO YOU MIGHT CONSIDER CHECKING THE FUEL PRESSURE AT THE FUEL RAIL. THE FUEL PRESSURE AT IDLE SHOULD BE 2.3 TO 2.5 BAR OR 33 TO 36 PSI. AS YOU REV THE ENGINE, THE FUEL PRESSURE SHOULD NOT DECREASE. ANOTHER COMPONENT TO CHECK IS THE FUEL PRESSURE REGULATOR, LOCATED ON THE LEFT REAR OF THE FUEL RAIL, JUST UNDER THE INTAKE PLENUM. INSPECTED THE VACUUM LINE FROM THE REGULATOR TO THE INTAKE MANIFOLD. IF THE HOSE IS BRITTLE OR BROKEN REPLACE IT. IF THE HOSE IS OK DISCONNECT IT FROM THE INTAKE AND CAP OFF THE PORT ON THE INTAKE. TRY REVVING THE ENGINE THEN. IF THE FUEL PRESSURE IS GOOD, THEN YOU MIGHT CONSIDER AN INJECTOR FLUSH. ONE OTHER THING I WAS JUST THINKING ABOUT. LAND ROVERS CAN BE PICKY ABOUT WHAT KIND OF SPARK PLUGS ARE INSTALLED. IF THE TUNE-UP WAS DONE BY A DEALER, THEN YOU DON'T HAVE TO WORRY ABOUT IT. YOU CAN REMOVE A SPARK PLUG AND TAKE IT TO A PARTS SHOP TO MAKE SURE THAT IT IS THE CORRECT PLUG FOR YOUR DISCO. THE PROPER PLUG IS A CHAMPION RN11YCC, AND THE GAP SHOULD BE.90 TO 1.00MM.

Hey rovertech, let me thank you again for your replys!I went ahead and changed my fuel filter, put some fuel in and drove it around for a bit, and things went fair. Still not running tip top if you will. So this morning I stoped @ Auto Zone and got a can of sea foam, put it in and then filled up.I drove around for about 30-45 minutes. Just before I pulled in to the neighborhood, BAM it starts again. So I thought, hum let me take it by American Fast Lube(where I just got my oil changed last week)mybe they put the wrong filter on, or put too much oil in, or something!So what do you know it was about 2.5 qts over!Last time we went there they didn't put the drain plug in all the way!I know I know Stupied me. Anyway I'm gonna drive it around a bit and see how things go. THANKS, Derek

Check your VSS-SENSOR veicle speed sensor my 1997 discovery had the same problem and the dealer replace the VSS sensor located inbetwin the trasmition and tranfercase.