Skip the auto shop - Our mechanics make house calls

Q: Truck is missing only when it is in gear

asked by on

A couple weeks ago my truck started randomly missing while driving then gradually got worse till it was constantly missing but only while in gear.It runs fine while in park.I replaced plugs,wires,and coil packs about a year ago.Yesterday I changed the fuel filter,cleaned the MAF sensor and checked all vacuum lines for a leak and it is still doing the same thing.The check engine light is not on or flashing and it isn't throwing any codes on a scanner.What am I missing here?I don't understand what else could cause it to do this.

My car has 161000 miles.
My car has an automatic transmission.

A: Hi there, thanks for writing in. If this p...

Hi there, thanks for writing in.

If this problem only happens when you’re in gear and accelerating, its very possible that it could have a transmission problem that causing a hesitation. I have seen issues like this before. It’s also very possible for the MAF sensor to cause a rough running condition without throwing a fault, or it could have a clogged fuel filter causing low fuel pressure. A clogged or sticking injector wouldn’t set a fault, but can cause a rough running condition as well. There could be a problem with a knock sensor or with the ignition timing. The best place to start would be checking if it’s a transmission problem or an engine problem. If it ends up being an engine problem, start by checking the fuel pressure and ignition timing. If you want to have this issue professionally diagnosed, you can contact a qualified independent technician through YourMechanic.

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

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: Car using fuel quickly

The car using more fuel can be due to a problem with an engine sensor, such as the mass air flow sensor giving incorrect air flow readings to the computer, or you may just have a clogged air filter. If...

Q: My passenger window regulator is broken and I'm trying to replace it but the window is stuck closed 1997 Toyota Camry

Hello - the window regulator has a lever or '"arm" which attaches to the metal frame holding the window. There will be a pin which connects the window frame and the window regulator arm. There will be a clip on...

Q: Mustang started and then died

There can be a large variety of reasons as to why your Mustang is not starting. When you add to the equation that it has been sitting for a couple of years, it may mean your Mustang is facing multiple...

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 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...
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...