I have a 2000 civic with a y5 bottem end a y8 top end skunk2 cam gear exzust headers an ex intake manifold an my car just started to rev to 3000rpm an than trop to normal idle an than it just continues to do so an never stops. I was told could be iacv? Not 100% sure figured maybe someone could help me out on here maybe they had same problem.

 

park your car with the nose up hill, take the rad cap off and let it warm up. Put your heater on full heat, and top up that coolant.

 

Ok thank you. I will try that

 

Ok i think its a tps sensor! But i still cant use the y8 intake manifold for some reason. It just wont idle right an i dont know why