I bought a 96 Pontiac Grand Prix SE Coupe with a 3.1l v6 a year ago for $600 with the check engine light is on it starts off as a steady light then it blinks a few times then it goes back to a steady light with the code p0300 random misfire. When I got the car I changed all fluids in it because it's sat for almost 2 years but the guy had the misfire problem before he took it off the road he's an older gentleman tall with heart problem and can't get into the Pontiac because of its ground effects so he ended up selling it he like the car and took good care of it but when I changed the the transmission fluid but It started to rattle from a cold start but it stop when it warm up it didn't do it before I change it. Now about a month ago the antifreeze started to leak I changed the water pump and it helps a little but it still leaks and the upper and lower water hose aren't leaking please email me answers @ walsh3085@gmail.com

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often a blowing head gasket, check that firsthttps://www.youtube.com/watch?v=QA7KVQq9vKA

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