Skip the auto shop - Our mechanics make house calls

Q: Car is misfiring and has a lack of power

asked by on

So i just put in a used motor. Pretty much everything is new. When its cold started it idles at 1,000 rpm and dosnt go down until u shift into reverse or drive. When u step on the Gas the rpms drop and chugs and finaly starts moving. I set timing and spark plugs are in order. There is no vaccum leaks.
My car has an automatic transmission.

It is very difficult to definitively say what the issue is. Have you had the vehicle scanned for diagnostic troubleshooting codes? If not, you should start there. Due to your vehicle being pre-1996, the method of receiving codes will be more difficult. You should look to your owners manual for that procedure. Hopefully, the issue will have set a code and will make diagnosis a lot easier.

If this is a misfire, its likely a code is pending. Chances are, this is a problem relating to the air fuel mixture entering the engine when the vacuum changes after entering a gear. If you are certain there are no issues with the vacuum, look to the throttle body, fuel injectors, and valves.

If you need some assistance with these checks, consider YourMechanic, as one of our mobile technicians can come to your home to diagnose the misfire firsthand and help you fix it accordingly.

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
  1. Home
  2. Questions
  3. Car is misfiring and has a lack of power

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: Help v8 4.6l 95 tbird

Transmission fluid that is leaking onto a hot surface such as exhaust or onto the body of the transmission itself will definitely cause the fluid to turn to smoke as it is burnt. The main question is what kind of...

Q: Ignition coil pack is not firing (1 out of 3)

It is not uncommon for an ignition coil to fail. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeated as the copper beneath them expands and contracts much quicker than...

Q: Car shut off while driving

Without additional information, it is hard to say what could have caused this. Your car has a variety of sensors that can cause it to shut down depending on whether or not everything is functioning correctly. I would suggest having...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...