I have volvo 1994 940 Turbo , I just recently replaced the coils , plugs and wires due to no-start issue ...the matter was resolved BUT when I drove car the acceleration is fine , starting is also fine BUT when I slowly step on the breaks the car chugs and chugs til it comes to a full stop ...need some advice , I realize I might need a break and rotar job...but its NOT a squilling sound but a chugs...Thank you in advance