My ls1 ss car had its fuel injectors stuffed. Symptoms were that it had no power at low rpm and there was a big delay in gear change at WOT for like five seconds and overall low power. The big giveaway was there is a light tapping from the engine and the injectors got loud at low rpm. So basically I put two bottles of gm ac delco fuel injector cleaner with full tank and drove it on the highway. Now the injectors are less noisy and if I go at WOT or even close, the car wheels spin on the road and burn out and then it shoots like a rocket, I mean now no delay in gear change. The injectors are still a little blocked and will require professional cleaning. I mean the difference is like night and day, now it has double the power. The other thing I noticed is its giving more fuel economy. But be warned, fuel injector cleaner destroys the exhaust/catylic convertor. So it is better you take the fuel injectors off and clean them. It will be less costly than to buy a new catylist converter.
