what would cause my car to have alot of loping during idling and while driving on 1995 Buick Regal

while the car is in idle {warm up} its like it wants to stall. while driving at about 35 and higher i get he same problem loping or arratic idle. whats up check all the vacuum hoses but haven't changed the plugs or wires yet i used some dry gas treatment thimking maybe its my fuel injectors what do you think the nest step shoukd be,

Asked by for the 1995 Buick Regal
There's no timing belt and it could be many things. Do you have a check engine light on?
No! I do not have a check engine light on. it would be nice if i did, that way i would look up a code.
Just because the light is not on doesn't mean that it has no codes. Get it scanned by a real scanner.
2 more answers , 1 more comment
egr valve proble has carbon stuck in it put on computer to test
I'm guessing it's your timing belt or the belt on the alternator. Needs a tune up.
I don't believe there is a timming belt on this car. i've been trying the highest grade gas fot the last month hoping that might help. but it getting costly,