VL missfire losing power

[STYALR]

hey guys im having a problem wiv my VL its an 87 berlina turbo and is seems 2 be missing underload it makes like a coughing noise wen my foot is down and if i keep it down it splutters and looses power and sumtimes on idle only been happening the past 2 days or so. Also my oil pressure is a little low it used 2 be high and stay up now its only up wen i accelerate? Could it be spark plugs or ignition leads. thanks in advance

[bangers]

could be the TPS. or the AFM.

[STYALR]

ok i will check that out cos im puzzled