sir DD,

just came from the pump specialist...told me the timing is good as long as the timing marks are aligned...yet he adjusted the shift cable for the transmission plus tightened the fuel adjustment screw because it is leaking...the acceleration feels smoother now...

as per his (mechanic) observation of the exhaust gases during sudden acceleration, the engine is fine except for some blowby. the blowby is acceptable since the engine is getting old.