hey guys. my 1990 jeep, 4.0L str 6 cyl. , has had a problem with slight hard starting for a few months, since I got it really. it seemed to improve slightly after some service, which included plugs, wires, air filter, fixing vacuum leaks and cleaning CCV tube. this service also improved rough idle issues and perhaps MPG. the fuel filter was not changed.
what happens is that it takes a few seconds (4 or 5) to fire up when turning over.
this morning it did not start for my better half, I have not checked it myself yet.
do you have any ideas, other than fuel pump, as to what might cause this or how I can troubleshoot this problem.
as I said, I want to eliminate all possibilities other than the fuel pump to begin with.