89 Lesabre loss of power on restart
New to this forum, and am looking forward to reading through post to find useful info.
My immediate problem is with my 89 Buick Lesabre Limited 3800, I recently bought it from my parents, I moved back to my home town in Oct 2012 the car had been sitting in garage for 5 yrs and was never started. From that point i have been starting it up after putting a battery and fresh gas in it, and letting it run up to running temp. several times a month. It ran great with no apparent problem even though they had stopped driving it because of a plugged catalytic converter. As i say it seemed to run good, until a wk after i bought it in Dec 2013. I hadn't registered it or drove it on the road yet when the ck engine light came on, since then its had some problems. since then whats been replaced by qualified mechanics is: Catalytic converter, ECM, ICM, Cam position censor, EGR Valve, Trans vacuum modulator and a injector wire repaired. The common problem that has continued is and all these other fixes where suppose to fix is, after shutting it off for 10 min to anywhere up to several hrs, when restarted i can put it in drive and it will run fine until the first stop at which time it starts idling rough and has no power until it gets moving with some RPM'*. once it gets back up to running temp it runs great. It some times backfires into the intake if i keep depressing the gas while its bogging down, the only code that can be gotten is an old history code 48 for misfire, but the ck engine light does not come on anymore, that stopped with the EGR replacement which is the last thing that was done.
Any ideas would be appreciated.