Vehicle towed in, cranked but backfiring and bogging down when cranking.
This was the second time it had come in for this sort of problem.

A new distributor had been fitted and a new set of plugs and leads.
This was an issue a few months ago when the repairer brought it in and it was found that we had two cylinders not contributing much to total output. We suspected a mechanical issue.

Vehicle had been taken back for the mechanic to look at the possible problem.

The timing chain had been replaced when the head was done.
Now we are back to a suspect timing or distributor issue.