1987 Chevrolet R20 Suburban Scottsdale 8 Cyl 5.7L
When im at an idle in gear its misfiring and you feel it it shaking you feel it hesitating when you drive. All parts new
Its high mileage and distributor cap, wires, plugs and rotor are all new parts.
Voltes V 9/3/2010
I'd suspect head gasket, intake manifold gasket.