I have a 97 base Deville. I Have relative ease starting it in the morning. Car does appear reluctant to start after it has been running for any length of time. Also car wobbles at low and high rates of speed. I have been told by GM techs that it may be bad tire composition. Rods and cv boot checked out fine. Tire techs say they cannot find belts broken because there are no lumps or knots in tires. I thought belts may break without visual knots etc. Anybody got any advise?

advise...replace the fuel pressure regulator if that does not fix it...you need a fuel pump...fuel pressure is leaking down...but i bet when you pull the vac. hose off of the fuel pressure regulator you get gas coming out of it...and thats bad...common problem check it out