One bottle of the Deep Clean Fuel System Cleaner saved me hundreds of dollars in repair costs. The engine in my 2003 Cadillac DeVille was idling roughly and misfiring. Two days ago, when I tried to start it in the morning, the engine idled so roughly that it stopped each time I took my foot off of the accelerator. I was dreading a trip to the mechanic, down time, and rental car costs. I nursed the car to the local auto parts store, bought one bottle of Deep Clean Fuel System Cleaner, and poured it into the gas tank. Presto! Before I was finished driving the car home it was running better. After a few more miles the engine was not stopping when it idled. Today, two days later, the engine is running more smoothly than it has in over a year! It is like magic. The car has more power and zip and the engine is now very quiet at idle. This stuff is amazing!

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