It starts great but ideles rough and drives very weak thoug it has recently overhauled why is this
You say over hauled. I over haul/rebuild engines and transmissions. The places I have worked don't. I did two engine rebuilds last week. One top end (head job), one bottom end (crank and bearings). Neither was an engine rebuild. But that is what you got charged.
Clearly the engine isn't running right and whatever is wrong with it needs discovering and putting right and a fuel pressure and delivery test will be part of the diagnostic process.
It is possible, considering the age of the vehicle and the fact lots of things will have been disturbed during the engine overhaul, that some of the electrical/electronic connections could be less than perfect, sensors damaged or just plain old and vacuum pipes split or wrongly connected.
The big mistake with working on old vehicles is assuming any repair or replacement will be straightforward when that is far from the truth. Things on older vehicles take two to three times longer because you don't simply fit an item as much as build it in to the vehicle with a high degree of engineering skill.
Failure to take that approach results in an inferior, flawed and unreliable vehicle that just wasted a load of money.
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