I have a 1997 Toyota Camry LE 2.2 Liter with 104,000 miles on it.

About a week ago, I filled up and about 30 miles into me driving on the highway, I noticed my car started to "sputter" like it wanted to stall out.(I was traveling about 65mph) I get off the nearest exit and I noticed about a second delay on the accelerator.

Later that day, my check engine light came on and I took it to auto zone to read the codes.(p300 and p304 for random misfires)
A week went by and the check engine light went off but I am still having that sputtering issue. It only occurs when I am traveling on the highway.

I had a tune up done at 96,000 miles. It included new plugs, wires, and a fuel system cleaner.

My catalytic converter is rattling when I am "idle" at a stop light and my RPM seems to drop below 1000RPM and it feels as if the car wants to stall out but it hasnt. Is the converter the problem or part of it

Any idea what to do? Im going in to replace the converter. Any suggestions?

Thanks!

 

P0300 is random misfire of cylinders.

P0304 is cylinder No 4 is having a problem with misfire, this is the one closest to the drivers side. One poorly working cylinder will cause the engine to run poorly.

Could be the spark plugs/wire, injectors, EGR, fuel pressure, timing, MAP sensor, coolant sensor, wiring.

The converter would NOT be the problem, if converter other codes would show up.

If you did the tuneup yourself recheck your work. Suggest pulling the plugs and looking at the electrodes for color.

Might be bad gas, this has happened to owners.