Engine misfiring. Spark plugs, ignition coils, spark plug wires, shitty gas??

Replace the plugs and coils. At 180K miles, they are long overdue.

How to change a spark plug on 2003 Toyota echo

Had this problem at 114,000 kls...put four plugs in....PERFECT...PROB. SOLVED.

switch out the coil that is misfiring and see if the code changes to another cylander that way you don't have to replace all of them because they are like 90.00 each

Girlfriend's echo has been having misfire constantly on #1 (and some of the others), no matter how many times I cleaned the water out and glumped on dielectric grease, the issue kept coming back. The coils started to fail a few months back, And I decided to fix it and stop bandaging it. I went out there one day after it was raining for a time, and noticed the underside of the hood was wet, and a wet streak leading to the oil cap. I used ABS to 3d printed a round cap to block water from getting in the oilcap hole. RTV used to fill in the cracks. Also RTV'd the "oring" where the coils are inserted. no more problems.

To follow-up. I spent $600 replacing all of my ignition coils, and my car was still having the same problem. I brought it to a new mechanic who tested the spark on my coils in their diagnosis and assured me that my stock parts were fantastic and didn't need replacing. Turned out to be my fuel injector, which was a common problem with my type of car due to the location of the injector under the engine. Personally I'm pretty pissed with my first mechanic who I paid $120 for my diagnosis and did nothing but run my faulty codes and I'm glad I did the job myself instead of let them do it. Hopefully this helps someone else out there.

Exact same issues: 2003 Toyota echo choking on the way home at the exact same spot every night. Found out it was my spark plugs and Corpak had a very trustworthy mechanic friend. Change them out for me. A month later it is now doing the same exact thing: started with the smell of a skunk and burning rubber. Then a sluggish start so I thought maybe the battery was going bad and time to replace it but it’s not that old really. And now it doesn’t wanna shift into third or fourth gear even at 60 miles an hour so now I’m thinking I have to replace my spark plugs and Corpak again, but what’s the point if they’re going to go again in another month? grrrr… I keep being told I’m going to have to take it to a Toyota dealership but I have very limited options because there are only two in this area and I don’t trust either one of them. Any ideas what’s causing my core pack and spark plugs to keep blowing on me???