Hi Back again with my 1998 Honda Civic misfire. It now has 133,700 miles on it. So far we have replaced the plugs with NKG ones, new plug wires, rotor and cap, fuel filter. Then Sea Foam to gas tank thinking bad gasoline. New ignitor. Next error code came up for catalytic converter. Replaced...

Here's a good link to help in diagnosing those engine stumbles and check engine lights on. Determining the missing elements in misfires - Misfires occur when the combustion process is incomplete, so you need to find what's missing. - Motor Age - Automotive training, certification & parts

I have an 1993 Dodge Van B150, 3.9 engine. I have noticed misfires when the temp gets cold. It seems to happen after the engine warms up a little and with speeds 35 mph and above. Have tried dry gas. Before winter I did remove the inside of the catalytic converter. The O2 sensor is before the...

I have a 1980 yamaha 650xs, it is hardtail and damn fast but latily I have been have this problem. It will only run on both cylinders if I pull the one plug boot off and hold it a quarter inch or so from the plug ( it runs great that way) but if I put it back on then it will only run on the other...

I have a 95 civic that at first hesitated to start. Then I noticed that when I started to accelerate after shifting gears it would hesitate or jolt. It then started jolting and sometimes not accelerating while trying to accelerate and driving at a steady speed. I thought it might have to do with...