Friend the easiest and most economical way is to make a scanner, you will save you to change things to change, the pulls is not only a injection problem and the one that goes out accuses a false or scarce air problem of this, you can have problems with the TPS that produces jaloneos but also does the MAP and the MAF, the irregular relief can be the IAC actuator or battery or temperature sensor. Check with a scanner that is my advice.