The vacuum harness is located directly behind the battery. The difference on acceleration is the force placed on the door swinging it one direction. It depends on how worn the mount is and how far the engine is lifting on acceleration. Think of it like this, it might not be your engine at all! Also, I would try a good fuel injector cleaner. The difference on acceleration is the force placed on the door swinging it one direction.
Motor mounts should be repaired as soon as possible. You could have brakes that are rubbing, or your transmission might be the problem. I still keep current with the latest automotive technology. You can check the operation by fully opening the glove box, removing the actuator motor on top… It could be a number of things. My battery terminals had corroded and battery acid leaked behind the battery and ate holes in several of my lines at the vacuum harness.
A miss on hard acceleration is usually an indication of an ignition problem--coil, spark plug, spark plug wire. Last, check for vacuum leaks. Your problem sounds like the common blend door problem on the Ford Expeditions, and Ford Explorer. . I had a similar problem with my F-150 and it turned out to be a vacuum leak. Your engine coils that fire your spark plugs could be going bad. There is a big list.
You can drive it in for repair , just avoid any rapid acceleration or deceleration because you can damage the catalytic converter This could be any number of things, that you will have to slowly and painstakingly narrow down. I would check the fuel filter, a clogged filter can definitely cause problems with acceleration. Not to mention it can damage your hood if the engine torques enough to leave the mount and strike the hood. It can cause hard shifting, clunking. Start with the basics, like making sure you have enough transmission fluid, and making sure your car can roll freely.
This would probably be a good idea even if it is not the primary problem. These are sometimes very difficult to detect, but the vacuum is… Of course it can. You can check the operation by fully opening the glove box, removing the actuator motor on top of the plenum… Lack of maintenance. . .
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