Hi guys, new here. I have a 1999 hilux xtra cab rwd, RZN154R engine is 3RZ-FE (2.7L Multi point EFI) that i bought second hand about 1 month ago, and it has acceleration hesitaion which is starting to annoy me, especially when driving round canberra where i need to accelerate quick. in any of the gears, even first, when i bought my foot right down it just sounds like its going to stall, similar to a badly tuned whipper snipper that burs when the throttle is opened. Then at around 20-30km in first it will just suddenly take off as the revs very slowly build up to that point (not sure what the rpm is as it doesnt have a tacho). It sounds like it is lean from the injectors not compensating for the wide open throttle. This is what i have done to try and solve the problem. Cleaned air filter, changed oil and oil filter, changed spark plugs, and cleaned the throttle body, i have also ran it on a tank of v-power 98 mixed with Nulon total fuel system cleaner, on the free way for 4hrs, helped a bit, but got worse a couple of weeks after treatment. I would normally ask at work as i am a 1st yr apprentice mechanic but the work is flat out there and haven't had time to ask yet. Help is much appreciated Thanks