No throttle response

[clint888]

Just wondered if there is an expert out there who might be able to help. My BMW 535 has developed a spasmodic fault. It starts OK but then for a few minutes does not respond to throttle pedal pressure. Then there is a relay-like "clunk" and all is well--till next time. Idles very erratically when not responding. Sometimes happens when driving and progress becomes very jerky. Have checked all the obvious--idling bypass etc but no broken hoses or bad connections. Any ideas anybody?