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LI've just bought my 306 2 weeks ago was running fine but then the eml came on and went into limp had a look it came up with p0320 so cleared it and then it started too over run I was told fuel pressure regulator so cut the tip off thought it was sorted until last no began hard too start then it keeps cutting out when driving help?
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If it's over running it's almost certainly the fuel pressure reg. You may have bodged it by cutting the filter off but it could probably do with a proper cleaning or even replacing. How many miles has the car done?
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Very common problem, there's a fuelling problems guide in the guide section that will help you narrow down the issue.
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You can reliably test any changes by full-throttle accelerating up a hill from low revs (1500ish) in fourth or fifth. If its going to cut out due to fuel pressure discrepancies it'll do it then.