Skip the auto shop - Our mechanics make house calls

Q: Car turns over and has a really rough idles but will not accelerate

asked by on

Ok so I have replaced fuel pump, fuel filter, plugs, wires, all 3 coil packs, cam sensor, bank 1, fuel pressure regulator, mass air flow sensor, pcv valve and hose, checked and cleaned egr valve, and the one cam sensor behind harmonic balence. The other cam sensor that is supposed to be Obove the oil filter which is also new and next to starter but it's not there so I don't know I am at a loss please help

My car has 120000 miles.
My car has an automatic transmission.

Hello there, many faults will cause your 1998 Chevrolet Malibu to have a rough idle but lack acceleration. Before any more parts are replaced the vehicle must be diagnosed fully to get to the root cause. With all of the parts you have already replaced likely faults are the torque converter, a wiring harness issue, or a throttle body fault. A qualified Technician such as one from YourMechanic will be able to diagnose your rough idle and no acceleration making any repairs require.d

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Oil leak

This suggests you may have a leak resulting from a failing gasket somewhere in your engine. As you know, there are many different places in your motor that are sealed by gaskets. I would suggest narrowing this down by placing...

Q: Why car surges when get in last gear n rpm goes up and down. shift good until last gear

Automatic transmissions can be tricky. When diagnosing them, always start with the simple solutions first. Low transmission fluid can lead to slow and or no shifting between gears. Check your owners manual for information on checking your vehicles transmission fluid....

Q: Warning signs of a bad fuel pump. Like sputtering when idle. Bad fuel efficiency. Shaking when at higher speeds. Less acceleration

This may be related to many different things such as: a bad fuel pump, dirty fuel injectors, a clogged catalytic converter, a faulty O2 sensor, or a bad mass air flow sensor. Unfortunately, there are many possibilities that can cause...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...