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Message: <blockquote data-quote="clayton" data-source="post: 1551398" data-attributes="member: 31409"><p>I need some help. Recently replaced a header gasket, I had a small leak where header bolted to cylinder head. Fixed the leak no problem. But now the car runs with low vacuum ( bounces between 5 and 10). Also it's running a lot leaner than normal. My car always ran kinda rich but now runs between lean and stoich area on my air and fuel gauge. Also at idle it surges on and off from 800 to 1200 rom. End result is now loss of my low end power. The car RIPPED off the line before, you couldn't keep the tires from shredding asphalt. Now they just chirp and slowly climbs in rpm until you get to around 4k then the engine will come alive. Same with down shifting for example ; cruising in 5th gear around 3k on the tach, throwing it down in 4th and smashing on the gas it takes off like a boat anchor. I can't find any vacuum leaks and literally all I did was replace a header gasket. Please help...I want my 331 to feel like the snappy little stroker beast she once was.</p></blockquote><p></p>