Blown Headgasket?

[DRock9]

My car will randomly start surging when I am driving it, but today it was finally hot enough to put on the AC. I noticed that when I sit in my driveway with the AC full blast, if i rev my engine it will go up then dip down to 500rpms and almost die...and then go back up to idle. It does this even when I am driving, it seems all the vacuum lines are connected...but also I noticed when I was revving it that white smoke was coming out of my tailpipes....it seemed to be smoke atleast I dont think it was dust.

What is a way I can tell for sure?

 

[Aryan15]

Pull the heads and look j/k. You can test the coolant pressure or content with chemical strips. Or if coolant is dripping from your exhaust. Or if your oil turned to baby crap.

 

[vikingpower]

Buy a compression tester at you local autoparts store, if one or more cylinders are way down compared to the others then for sure you blew a head gasket. When I blew one a few months ago, two cylinders read ~80psi while the rest were right at 150psi. Dont forget to disconnect the ignition coil and the fuel pump (I have a kill switch wired in for mine) when you do it.

 

[88mouse]

The idle jumping up and down sounds more like the IAC. Take it off and clean it with some carb cleaner. Does the car miss or anything? If it was a blown head gasket it would do it all the time.How many miles are on the motor. Maybe bad valve guides or something like that.

 

[DRock9]

The motor has 122K on it, it seems like it has a miss when I am really getting on it in the upper RPM's...might be hessitation. If it is a head gasket I am going to be happy because then I can pull the heads and replace them, I just don't want to pull them if I don't have to.

 

[DRock9]

Anyone?