Brought the VR6 out of hibernation at the weekend. Battery was completely flat after sitting for 6 weeks so a jump start was needed. Took her for a 40 mile run to charge the battery and shake the cobwebs out. Had her out again last night, started on the button. 20 mile drive, no probs. This morning on the way to work she drops below 500rpm and cuts out every time I take my foot off the gas. If I try to start her with no gas she just turns over. A little pedal and she starts but cuts out again as soon as I ease off. Unfortunately I can't find my OBD cable at the moment to run a scan. What shoul