Engine revving problem, 1999 chevy malibu ls 78k miles
When i am driving, my rpm's go crazy. car accelerates on its own thus making the brake pedal very, very stiff. when the car is acting up, if i put it in neutral, the rpm's can go as high as 2500 or so. no one has any idea what is wrong, and the problem is intermintent. help!!
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Your first issue could be a few different things and as in most problems like that someone would need to see the car to tell you for certain. Your second issue is most likely as you said a brake issue. It could be that your brakes are metal to metal. That is telling you it is not safe to drive. The more you do the more it will cost to fix.
You are hitting the rev limiter top range, which cuts off your ignition.
I have a 2001 Grand Cherokee and the problem drives me crazy, but it is the way the car is designed- as soon as you hit the rev limit, it shuts down ignition and your jeep will "buck" - a real pain when you are trying to accelerate into traffic!
You have the 4.0L straight six engine, yes?
If so, please take my advice and learn to live with the minor annoyance of the rev limiter- that engine is IMHO the best Chrysler ever made (nearly "bulletproof"!) and it was so reliable you cannot even get it in a jeep now! For decades, that engine was used in welders, tractors, generators...and yes, jeeps... and it is a favorite among mechanics for its durability!
It sounds like you might need to replace your motor mounts, or get a tier allignement done. The allignment you cannot do yourself but the motor mounts you can this requires you to place a jack under you engine and undoing the motor mounts then replace them and take away jack.
If the check engine light is on, I would take the car to an autoparts store and have them scan the computer for fault codes. Most parts stores will do the scan for free. It sounds like it could be a faulty idle air control valve, but getting the codes should end speculation and identify the faults that the computer has noted. Hope this helped and best wishes.
Is the fliud a lite clear brown/tan (brake fliud) or is it a dark black colour (gear oil)? It sounds like you have a brake fluid leak. Check your steel line on the rear axle and then remove the wheel and drum and check the wheel cylinder. Top up your Master cylinder and bleed the brakes. You might find the light scrubbing noise gone.