Originally Posted by 89 Foxloco
What can I do at the moment or what has to be done?? When I rev it I hear a good loud pop inside the intake...
Try cleaning the MAF sensor first.
Use some rubbing alcohol or sensor safe carb cleaner and a cotton swab.
Be very careful to not break the sensor.
The pop in the intake could be caused by a timing issue or a vacuum leak.
Spray some carb cleaner around the intake and fuel injectors to see if the engine speed changes while it is idling. Be careful as the carb cleaner will damage any painted surfaces you get it on.