I got my 1995 Jeep Grand Cherokee Laredo tuned up about 4 months ago. They also told me it needed a servicing done on the fuel injectors. In the 8 years I've owned this car, it has never been a problem starting it, even at 40 below zero. One crank, and it starts. It has had a cracked exhaust manifold for a few years, but we've been unable to afford to fix it. However, that didn't seem to ever cause a starting problem.
I took the car back to the repair shop (at a Chrysler dealership) and told them about the problem I'd had since their servicing job. They said it was because of the manifold. I told them it has always started right away. They kept it for 2 days, and the only thing they could do was tell me it was NOT the fuel pump. I had told them the fuel pump was replaced 5 years ago, and I didn't believe that was the problem. I have not been able to take the car back, as it is the only vehicle I have and they don't have a loaner car, and I have to drive to work.
What do you think the problem could be? After it sits for more than about 15 minutes, it is hard to start. I'm going to wear out the starter motor. I've found that if I let the engine turn over for 2 or 3 seconds, and then stop and try again, it will start usually the 2nd or maybe 3rd time of doing that. But winter is coming, and I'm going to use all the cca's on my battery just starting the car.