Start engine and gauge reads 20 inhg, after the usual rev drop after about a minute the needle on the gauge drops to around 26/28 inhg. What can this be as it seems too high to be idling at that.
Because a google search tells me it should be between 18/22 and it used to be 22 before I had my recirc valve and boost Solonoid changed. Since having them changed yesterday there’s a massive differenceWhat makes you think this is too high? Is there an issue with the car?