This car wouldn't go 50 mph. Just dogged out. I changed plugs hoping for a fouled plug. no such luck. frightened to death of going to Nissan dealer after being slammed for ignition coil packs. $2000.00 I proceeded to local Autozone and asked Manager Dave of any possible symptoms. I had a bottle of typical injector cleaner. He told me to put the other back and buy Lucas fuel injector cleaner so I did. I drove down the local I 90 thruway 50 miles. This stuff had this 230 horse Maxima screaming again. I could not believe it. Everybody, before to start replacing all kinds of hopeful parts, spend $5.99. You might have the same luck. Again Lucas Fuel Injector cleanr. This stuff works. Big savings!