Within the 4AGZ intake manifold- the #1 runner, which can be Pet dog-legged, needs to be stuffed and recontoured. This is an easy method that need to be performed. Be sure you often check the supercharger oil also. Several models have died on account of oil starvation.The 1st-generation 4A-GE which was released in May 1983 changed the 2T-G as Toyot