Q: a very bad miss in morning

asked by on

Some mornings I start car and idles great. When I take off it shakes very bad and misses. Mechanics have replaced fuel pump, injectors, fuel filter, catalytic converter. When I finally get it to the shop and mechanics crank it to test drive it runs perfect again. Has happened about 6 to 8 times over last few weeks. No lights come on except once, service engine soon and showed the injector problem. They have also changed a couple of sensors. When giving it gas is when it misses during these times. Can't get above 15 MPH during these spells I trust this shop a lot and have used them for years. It is a 1998 Pontiac mini van loaded. Also looking for a dash panel to replace cracked one or a way to restore this one that doesn't look like a hot rod. thanks

My car has 192000 miles.
My car has an automatic transmission.

Hi and thanks for contacting YourMechanic. Check the ignition system for any burned spark plugs and burned plug wires. Make sure that all of the spark plugs have a solid blue spark. If the ignition system is working correctly, then check the mass air flow (MAF) sensor to see if the contacts are damaged or if the sensor is dirty. These will cause an intermittent misfire to the engine when put on a load. If you need further assistance with your vehicle, then seek out a professional, such as one from YourMechanic, to help you with the misfire in the mornings.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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. a very bad miss in morning

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: I want to replace the cluster panel. Now does the mileage be stored in cluster panel or in computer. I am getting a used panel.

Hi there. Remove the dash panel cover and take out the gauge cluster. Check to see if the odometer is electronic and see if there is a little cover. If there is a cover to the case, then remove the...

Q: 1999 Pontiac Grand AM runs rough and smells weird

Hello. An engine running rough at idle could be a vacuum leak creating the wrong fuel ratio for the engine to operate correctly. The smell is probably unburned fuel caused by the vacuum leak issue. The belt shredding could be...

Q: Battery drain, brake warning light on

Hello. If the battery is draining as the vehicle sits then most of the time this is caused by a failing ignition switch. I have had a lot of these fail on this vehicle. I usually start by doing a...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.