Gumout 800001364 Regane Complete Fuel System Cleaner, 6 oz.

Works will in my wifes Car

Our 2004 Durango had issues. The check engine light had been on for many months, and the code indicated an O2 sensor was the issue. But it still ran fine, and since we didn't use it that much, we never replaced the O2 sensor. But then the Durango started running rough. When it first started, it idled rough. When going slow and steady it usually ran ok, but any demand for more fuel, like accelerating or going uphill, and it would miss like crazy. The Durango would also shake and you weren't sure if it would keep running or not. The check engine light would also flash during this time. So we started thinking about where we were going to take it to get it repaired. One day I decided to try a bottle of this Gumout fuel system cleaner. The first couple of trips still had the same missing issues, but then it gradually started to get better. (These were all short trips to the store and back so it took a little longer to work). But then one day the car started up and idled just fine. It accelerated just fine, and the check engine light was out for the first time in months! From then on, the Durango never missed again, and the check engine light never came back on. The old Durango now runs as well as it did when it was new! I don't know how this stuff could even help an O2 sensor, but apparently it did. I have since put a second bottle in the car, and will order another one just to have on hand. This is a great product that really works! In our case, it was a miracle in a bottle!

It's got PEA which some don't even claim to contain. Use this as a preventive to keep carbon build-up under control to prevent future problems. The price is right, a lot cheaper than some. Time will tell.

As a retired auto tech I use this to help keep fuel system clean in our vehicles. About every 2000 miles. Also add it to a tank of gas on fill up if vehicle is going to sit for awhile as we live in an area that gets cold and can generate condensation in fuel tank.

My 2002 Sentra would idle very rough at cold start sometimes. And once it didn't even start for a while. No issues since I ran this through!