Skip the auto shop - Our mechanics make house calls

Q: 1998 f150 5.4, sputters when passing or anytime getting down on the gas. Replaced 2 bad coil packs and changed plugs. Did notice t

asked by on

1998 f150 5.4. Sputtering and stalling when giving gas such as trying to pass on the highway. Changed plugs and 2 bad coils. Noticed when I changed the last coil the plug coming out was wet but no particular type smell. Have rn 2 as of sefoam thru the tank. What to try next.no codes present. Strangely every other day my daughters Nissan altima is doing the same thing but not as frequent and it's coding at auto zone a transmission problem but the transmission folks say there's nothing wrong with it. I'll try whatever you answer on both vehicles.

My car has 200000 miles.
My car has an automatic transmission.

On the Ford, if the plug was wet but did not smell like anything, this may be due to oil getting on the plugs. Have a compression test done on the cylinders to make sure you have good compression, and then have the injectors cleaned to make sure they are in good condition.

On the Nissan, you would need to supply the codes to help with a diagnosis. A misfire on these may be anything from shorted wires in the spark plug hole to oil leaking from the valve cover shorting the wires. Remove coils and see if they have oil on them. Replace the spark plugs, coil boots, and the valve cover gasket. You may want to check a fuel sample to see if you got water in the fuel if you happen to get fuel at the same gas station. Water on the plugs would also not have a smell. If you would like to have this checked, consider having a certified technician from YourMechanic, inspect the sputtering issue to have this addressed appropriately.

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!
  • Home
  • Questions
  • 1998 f150 5.4, sputters when passing or anytime getting down on the gas. Replaced 2 bad coil packs and changed plugs. Did notice t

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: Something wrong with fuel system.

I would recommend you ask for help from a diesel mechanic with a diagnostic scanner. He will be able to see what fault codes are in the computer and that will give him starting point for diagnostics. This will help...

Q: I installed a new crankshaft positioning sensor, now I'm getting misfires and code P0300. Is this supposed to happen?

Assuming you replaced your vehicle's crankshaft position sensor for a P0335 trouble code and that code has not returned, this leads me to believe that the new sensor is either faulty or misadjusted. The sensor replacement should not have caused...

Q: bought a brand new starter brand new starter solenoid truck does not want start and I have no power on the inside of my vehicle

To determine if the engine is seized, simply attempt to turn the crankshaft pulley bolt clockwise and the crankshaft should rotate. If the spark plugs are all removed, the crankshaft will turn with relatively little resistance. Of course, if the...

Related articles

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...
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...
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...