I have recently purchased a 1990 E30 318is, which has been unused for around 18 months and has been parked outside. It started fine with a battery booster and I was able to drive it to its MOT with no problem. Having got it back from the garage it has developed a problem where it will start and idle (a little erratically when cold but then settles) but as soon as I press the throttle, it won't take the power and usually cuts out at that point. Any ideas on where to start my checks would be really helpful. Thanks.