car is running way better now that i put a gasket on the egr. the leaks gone now and drives great but at idle im getting a little surge rpm will go to like 700 car will shake a bit then go back up to like 950-1000 then will run smooth at like 850-900 for a couple seconds, im still using the 84/85 maf but have 86/87 ecm. could that be why