What causes a cylinder to misfire? ... All the firing voltages should increase during the snap-kV acceleration test, but, ... Misfire under load accompanied by low overall spike heights during the snap-kV test would tell you the available voltage from the coil is low. The most likely cause, in this case, would be a faulty ignition...
www.aa1car.com/library/misfire.htm www.aa1car.com/library/misfire.htm
Sometimes, an engine will idle smoothly, but will misfire under acceleration. Conversely, the engine will idle roughly, but accelerate smoothly. In reality, we can’t always say what causes a misfire specifically, so let’s just stick to the notion that it’s bad combustion.
www.moparmagazine.com/2009/march-april/ready_aim_fire
>"Also a lot of misfire is noticed at cruising speed on the highway while running at 60- 65 mph. Nothing bad but you can feel the missing while cruising." ; If it still misfires under acceleration or at higher speed with richer mixture, then it has to be a spark problem. ... This is not what causes it to run bad when cold,
mgaguru.com/mgtech/care/cf106.htm
When trying to accelerate quickly from a stop it shakes or seems to misfire. ... If you are in traffic, stop, and go, sometimes causes it to stall. ... While driving the car under acceleration, you should have approximately 5 lbs of boost. If no boost is present, you have turbo problems. Other things to check or replace are fuel...
www.2carpros.com/topics/accelera.htm
This condition may cause misfiring at high engine RPM. Shiny deposits usually suggest that temperatures have suddenly increased during hard acceleration. As a result, normal metallic deposits do not have a chance to slough off the plug and they melt and form a conductive coating which causes the misfire.
www.gnttype.org/techarea/engine/plugs.html
These small amounts of water can cause intermittent misfire under acceleration from low RPM's. This is caused by the water momentarily shorting out the spark plug gap due to it's conductivity.
www.jetworks.net/h2oinjkit2.htm
Document2 (PDF File)
For example, a coil that is beginning to develop a defect could have no noticeable effect on engine performance at idle when the running compression pressures are low, but will cause a cylinder misfire under acceleration when cylinder pressures are high.
www.endwrench.com/pdf/elec/FtIgnitionDiagOpS00.pdf
94/95 2 dr yukon bogging /misfire under acceleration ... 1999 Yukon - Finally fixed misfire under load at 70 mph ... 03 Yukon..A/C causes noise on takeoff...
www.automotiveforums.com/f184.html
; Why does 03 crown vic 4.6 3cyl constantly misfire under acceleration? ... ; Whats causes a 2001 lincoln ls to hesitate under heavy acceleration?
wiki.answers.com/Q/FAQ/476-29
2000 Pontiac Sunfire TSBs (Technical Service Bulletins) ... TSB #290702 -- A CUSTOMER MAY COMPLAIN ABOUT AN INOPERATIVE AIR CONDITIONING SYSTEM OR A HESITATION MISFIRE UNDER ACCELERATION WHILE THE AIR CONDITIONING IS ON. *TT (NHTSA ID #637335, JULY 29 2002)
www.carcomplaints.com/Pontiac/Sunfire/2000/tsbs.shtml