i have a 1992 b4c camaro with the z28 5.0 tpi and 5 speed. yesterday i was driving and the car was running fine then stopped at a red light put the car in nuetral and the idle was like 2500 rpms, so i made it home still doing the same thing but now a little higher rpms so i was checking some sensors and while i was fooling around i knocked off a vacume line to the knock sensor after i realized it was off almost all the vacume was getting sucked in the hose i plug it back up now the car wont start. also does any body know why the car was idling so high

 

Please somebody help i also had degreased my engine before i drove it home HELP!!!!!!!!!!!!!!!!!!!!!!!!!!