hi, please need help on this one, i'm not a mechanic i like just to fix any things that is not working properly, some knowledge but not good as a mechanic. we pulled out the engine of our forklift caterpillar with 4g64 engine smoking and hard starting found the problem ring worn out, valve seals and cylinder worn out, change the piston and ring rebore was done and machine shop did decking also (not sure if right word decking). me and our maintenance guy assembled the engine back together and it fires easily idles good like its a brand new engine. so we let run for like 3 days in row some sort of a break in. then we did a change oil then tried to use it, however we notice that when the driver revs it to lift the forks the engine is somewhat choking or its starts to shake like your running out of propane but not stalling or dies. and also when there is heavy load it cant go up the ramp as it was before we have almost 15 to 20 degree ramp, so what we did i tried to adjust or turn the distributor to point that it max adjusted already, i check with the timing light and confirm it in 7 +- 3 degree which website say for 4g64 1994 engine. is there any possibility that i was bore out and needs more propane to the sense that we need to adjust the impco 100 carb or propane carb to say, are we missing something out on our rebuild or some sort of a vacuum issue that we need to check, however i turn the distributor retarding it stalls advancing it revs up to certain point then engine starts to shake and like its lacking propane or chocking.
please we need the forklift running or i'll be in deep trouble to my supervisor and manager.
any insight and help in advance i'm already thanking you guys.