Skip the auto shop - Our mechanics make house calls

Q: Rough when accelerating sluggish

asked by on

My 2.0 Tubo runs very rough when accelerating and doesn’t have much power. The problem started without warning. I didn’t get any warning lights or codes on my dashboard. I have changed all the old vacuum hoses, connections, and inter hose units. The car ran OK for 10- 15 minutes. Then it got very sluggish again. It idles very smooth. But when I rev to about 2500-3000 it starts to get sluggish and runs very rough but coming down to an idle its runs very smooth. Do you have any ideas on how to fix my car?

Hello. One of the first things that I recommend checking is the fuel pressure. Have a technician check the fuel pressure on the vehicle to ensure it receives the proper amount of fuel as the the gas pedal is depressed.

If not, you may have a fuel delivery issue such as a weak pump or leaking fuel line. I also suggest checking the catalytic converter for clogging.

The sluggish performance you are experiencing could also be due to an ignition module, crank position sensor, or throttle position sensor becoming faulty when warm.

Finally, there has been some cases where the intake manifold gasket becomes warm, and has started to leak. There’s a wide variety of issues, which can cause these symptoms, so I suggest that a technician look at the vehicle firsthand to determine why the engine is running rough.

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!
  1. Home
  2. Questions
  3. Rough when accelerating sluggish

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: AC quit working

Hello. The symptoms you are experiencing can be caused by a variety of issues. The first thing I would check is the pressure of the system, as a system that is low on refrigerant may not produce cold air. I...

Q: Car starts, then stalls in one second.

Hi there. This can be a computer issue, but from the codes and the issue it sounds more like a voltage problem. If there is low voltage from a bad battery or a bad connection then the vehicle will act...

Q: Brake lights not working in 1998 Saab 900

The third-brake light should be checked to see if it is working, first. If it is not working then the brake-light switch, a bad fuse, or an unplugged harness could be the problem. Try giving your emergency flashers as a...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...