To start off, I don't expect you guys to automatically know whats wrong with my car. I'm partially looking for advice with this thread, but also using it as a journal of sorts to keep track of what I go through with this problem. Anyway, the problem: I bought this car about four months ago for less than two-thousand USD. It's my first car, and I always wanted a wagon, so this was perfect. For about the first month, everything ran smooth. Then, the spark plugs started acting up. Replaced those, and everything was peachy again. Now, about a month after changing the spark plugs, I'm having a problem that's hard to describe. The car will be fine and the transmission will shift as intended, and then all of the sudden, a check engine light comes on and the transmission (I assume) starts to get clunky in a way. It's happened four times now. The first time, I was in a drive through, and the CEL came on. I pulled into the parking lot to inspect things, and could find nothing immediately obvious wrong with the car. It drove as intended for about two miles, and then as I rounded a corner from a stop light, second gear started doing the clunky thing, and wouldn't accelerate past 20 mph. I pulled over, contemplated what I should do, but knew I could do nothing sitting on the side of the road, so I pulled off and headed home as I was only 5 minutes away. It didn't happen again the rest of the way. I drove the car again that night for about ten miles and nothing went wrong, no CEL. A couple days later, I was coming back home from a relatives house, about a 30 minute trip, very heavy traffic, and as I got close to my house, the car didn't want to accelerate again, and was "clunky". Thats the only way I can describe it. This time, it felt like it was every gear doing it. I parked it, shut it off and then turned it back on, and it kept doing it. I got home, and then shut it off and let it sit for about two hours and decided to test it again. It operated as intended. Yesterday, I made the same trip, but went out of my way to avoid traffic. As I neared my house, the CEL popped on, but nothing notable with the transmission happened. As of this post, I just ran the car from a cold start to operating temperature to check the transmission fluid, and to me, it seemed low. I filled it to approximately the full mark for a hot temperatures and ran it again to double check the level. I scoured the internet since the first hiccup, and came across a thread that pointed to possibly a grounding issue with the transmission. It half-way described my problem, but my grounds seem okay, even after unbolting and rebolting them, but I won't rule it out, For now, I'm going to assume (and pray) that the low dexon level was my problem. I'll post again if I have more issues. Feel free to reply with advice, it's all appreciated