I have a 1990 integra rs, A few days ago my car started idleing really weird (cold start up idles at 3000 rpm, steadies out to 1000-2000 rpm. give it gas and it jumps between 1000-2000rpm.) I have replaced the IAC,map sensor andpcv valve. I dont have a check engine light on. i'm going to replace the coolant temp sensor tommorow. could this be a vac. leak?....can anyone help me? Joe