I happen to drive a 96 Hilux Surf. 2 months back the pick/shoot of my 1KZ died/ v low of what it used to be. The acceleration pressure was there but the pick in first 2 gears was very low but eventually got better in higher gears (automatic). As per my mechanic the diesel pump (with the engine) needs to be thoroughly checked and it might be costly incase it's body etc. is effected. 2 weeks ago on high recommendation I used Toyota's Diesel Injector liquid (silver bottle) and surprisingly in like 2 hours time my SUV started boosting like anything. I felt as if my vehicle is all sooped up and I was enjoying the ride. Yesterday I got my Surf serviced and had change of oil, oil filter, diesel filter, air filter etc and once I got out of the service station the condition of the engine's pick up was back to square 1 i.e. before I added the injector cleaner Now I am confused should I add another bottle, wait till the tank empties and then add the cleaner with refill - I am not too sure whether it's the diesel pump (there are 2 diesel pumps though) or the injectors which were cleaned by the cleaner and got clocked again... Can anybody advice??