I was using this stuff cause i heard good things about it. As i was spraying this stuff into my throttle body while moving the butterfly valve back and fourth, the engine cut off after 4 seconds of direct spraying. the directions says spray 10 seconds wait 10 seconds, but as soon as i get to 4 seconds the engine stops. Is this normal??

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86 firebird 2.8
K&N replacement filter
modified air box
MSD ignitor

 

Yeah, that's what mine did too. Just spray it till the engine starts to sputter, then give it a few seconds and spray again. You're not hurting anything and it should clean out the carbon buildup pretty good.

 

Hold the throttle open a little while you spray it in, it wont stall on you then.