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You aren't saying what the manufacturer of the vehicle is, no the year, make, model, or engine size. However, if you are a commuter and drive long distances daily at a fairly constant speed, over time what can happen is that the Throttle Position Sensor (TPS), can get a "dead spot" in it, where there will be a dropout of the signal to the ECM and an accompanying hiccup of the engine. It feels like a misfire, but only happens occasionally, and only at certain speeds/rpms. It will usually get worse over time. As a test, try driving one trip about 5 mph slower than usual. If you don't get the issue, change the TPS and see what happens.
sounds like a fuel system issue, if it is firing all the rest of the time it should be ignition system. Maybe worth having a GOOD mechanic look at it. You appear not to have a heavy right foot, cruising rather than revving can , (used to be considered,) to cause residue build up in the fuel system. (has your fuel filter been changed recently?)
I think that the services of a competent mechanic would benefit you
Does it cut out at 3000 rpm in ANY gear, or just at highway cruise in high gear? I ask this because what can happen is that if you spend a lot of time cruising at one speed (long-distance commuter, over-the-road driver), what can happen is the the TPS (throttle position sensor) will get a dead spot on it from excessive wear. This will cause bucking, drop-offs, a stuttering whenever you happen to hit the dead spot. Typically, timing or ignition-type problems are not going to be rpm dependent, although they may be felt more prevalently a certain speeds/rpms. Transmission issues usually occur at shift points, and not at cruise speeds.
If the car has no Check Engine light, and it operates well at all other speeds, then I have a question to ask.....have you had the vehicle for a while and is this a speed range that you drive at consistently for extended periods of time? I say this because if you drive at consistent speeds for long periods you can actually wear a dead spot in the throttle position sensor (TPS). This will cause a drop-out at the point of the dead spot which feels like a jerking motion.
You have water getting into your engine bay, it may be running down the firewall to your ECM and PCM cable bundles and seeping into the car or you may be spraying water into your airbox.
check to make sure your airbox is tight and look and feel under your dash for a wet spot near the fire wallis it's your airbox,,,, stop spraying at it, if it's wet under your dash take it to a shop to get it sealed correctly
It may also be the catalytic converter. If that gets plugged up it puts a lot of back pressure on the motor. This will make it hard to get up to speed. When not pressing much on the petal it will seem to run fine. Then when you press more to increase speed you will feel it.
If you were low on clutch fluid the clutch would not disengage, it would not cause the car to be slow, but it would be difficult or impossible for you to change gears. If you feel the clutch slipping while driving, either the clutch disk and/or pressure plate are worn, or possibly have oil in then from a leaking engine or transmission seal.
There is some loose conduct in the connection from the engine delta coil side which is connected to spark plug.Tat part is having some loose connection which makes the car to **** and stop when you accelerate.