You can find load of info on how to make sure your engine is getting the proper mixture of fuel/compression and or fuel/air. Alot of tunning issue's are related to not enough or way to much fuel. This is a must read for any and all tunners beginer and or advanced.

Mechanical Fuel Injection (http://www.users.bigpond.com/INTERJECT/KJETRON.HTM)


Electronic Fuel Injection (http://www.vectorbd.com/peugeot/bosch.html)

Any questions just ask as fuel can be very confusing...