About a year ago i put my 86 manual Hilux in for a pink slip and there was major problems with the cylinder head. The mechanic replaced it but also did the carburettor without asking. Before, the little Lux never skipped a beat (even though it was dying on the inside) but after the carby switch there was more resistance on the accelerator and it got so gosh darn loud (very high rpm but that got sort of fixed). It smelled of fuel so we thought it was running rich but before we could do much our living circumstances changed and it became a daily car to move around in. Everything was fine until it just stopped working. I drove it at around 100kmph (60mph) for some 2hrs and it was fine. Pulled over and it would not run at all. Turn over but it would barely reach top of 1st gear and upshifting and downshifting did not help. Some amateur mechanics stopped to help. First they looked at the throttle and it made no difference in the rpm, so they then looked at the carby and found both adjustment screws open nearly all the way. So they took it back to factory (close them both and then even 1 and half turns or whatever) and it worked very well...for about 8 days then it died again. No power so it stalled out. I took it to an actual mechanic who didn't really know carbys and he fiddle the screws too but this time it did not run at all. What might the problem be here? Road side assistance who stopped when the amateur mechanics did said pretty much the same as them. I have had some 4 different insights on this problem and nothing has changed. Any help?