Some Cadillac Escalade ESV owners report experiencing severe shaking issues after push rod and gasket replacement, which may be attributed to several potential causes. Disconnected air or vacuum hoses can lead to violent engine vibrations, while faulty transmissions in certain models have been linked to a 'Chevy Shake' issue that causes the vehicle to jerk during gear shifts. Additionally, problems with lifters and camshafts can create significant engine disturbances, potentially requiring extensive repairs or engine replacement. Bent push rods or damaged camshafts may also contribute to these issues, necessitating thorough inspection and possible replacement. Furthermore, hydraulic lifter damage combined with a bent push rod can exacerbate engine shaking. Owners experiencing these problems are advised to consult a qualified mechanic or dealership for a comprehensive diagnosis and effective resolution.