Car chugging

I started my car after being out with it twenty minutes earlier so the engine was a regular temperture. I was driving out of my driveway and the car started chugging and the RPM was bouncing up and down like the car was going to stall. The road was a bit bumpy from ice and snow. Once I stopped the car about 2 minutes later the engine chugged then resume normal idle. This happened again skiing I let the car warm up for a couple of minute the temperture was minus 6 degrees celsius outside not to cold and the car started doing its chugging thing only when I put the car in gear, it was fine to idle in park. I am thinking the oxgen censor is loose and when I go over bumps it causes the car computer to go nuts. I have a 93 Maxima (230K) that I have installed Iridium plugs less than a year ago and a K&N filter which was cleaned six months ago. I had the oxygen censor replace a year and a half ago because of the RPM going up and down. Could it be anything else and what should I check?

Thanks

I started my car after being out with it twenty minutes earlier so the engine was a regular temperture.

I have a 93 Maxima (230K) that I have installed Iridium plugs less than a year ago and a K&N filter which was cleaned six months ago. I had the oxygen censor replace a year and a half ago because of the RPM going up and down. Could it be anything else and what should I check?
Thanks


One issue is extended idle you use to have according your text: that has filled your combustion chambers with soot, and should be cleaned (seafoam?).

"Could it be anything else " ...yes and then some. Your car is a computerized moving sensor platform. Check those.
I live in similar luxury, have combed through a few problems which come via aging and documented them for you plus 'our club'. See my web page what to do...

I had a problem with my 2k maxima chugging and it turned out being at least one bad coil pack.

I tried disconnecting one coil pack at a time to see which one was the problem, but it was very intermittent so it was difficult to figure out which one(s) was to blame.... and I heard they started going bad after about 90K, so I just replaced them all.

The fixed my chugging problem immediately.

Ok..I changed the fuel filter, rotor, distributor cap and wires tonight (Nissan parts). Lets see what happens. I changed the plugs six months ago with Iridium NGK's so they are still good. Car runs really nice but I was trying not to break down and spend money on it since I am selling it or trading it in. Figures something like this would happen.

Car is running much better, however it did lose power for 5 seconds on two occasions and then started running normally. I guess the problem is still there but not as bad as what it was. Looks like it could be the coil or plugs.

Car is running much better, however it did lose power for 5 seconds on two occasions and then started running normally. I guess the problem is still there but not as bad as what it was. Looks like it could be the coil or plugs.
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No, its not. Coil is the last part in u car to break... plugs u changed already.

But u did not repair the grounding pin attachement to the distributor or did not make an add on ground wire as I suggested. If u cared to look the scope pics, u could see what it causes. ECU does not get good square wave...

And dont clean those connectors, keep posting.

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