Assuming it's a CIS system, have you tested the fuel accumluator? I had intermittent hard cold and hot starting problems, which got progressively worse. I did a simple on-the-car test of the accumulator. It failed, and a new accumulator solved the problem.

The accumulator developed an internal leak, which made it difficult to maintain proper system pressure. It may start out as a starting problem, but get progressively worse and cause the engine to run poorly or stall.

Search my handle for recent threads I started on the subject, including the simple on-the-car test.

I think a lot of fuel pumps and FPRs get replaced, when the problem is an internally leaking accumulator. Of the three parts, the accumulator is the least expensive and easiest to change.

Duke