i have a 1992 civic dx (completely stock) and car accelerates and decelerates when i turn it on and keeps on but quickly i think its a sensor but want to know which one

 

being vague wont get you any help. im asumming you have an idle fluctuation issue ? get the IAVC plug and make sure the TPS and MAP sensors are pluggged in. look around the manifold for any hoses loose or disconnected

 

check your FITV...it's located directly under your throttole body. take it off and follow these directions
https://honda-tech.com/zerothread?id=699787