Had my car in for a bit of welding a picked it to find it running like a bag of bones, idles at 1200 then drops down to 800 noticed it drops down to 200 nearly stalling when I turn the blowers on, car revs fine in neutral can redline it but when driving as soon as I start to build boost it breaks up and starts spluttering makes a quiet poping noise when's it's spluttering struggle to get it to rev past 3.5k unless change gear and keep it out off boost any one any suggestions ?
Since it's happened I've replaced fuel pump to walbro,changed fuel filter,fuel pressures as should be, plugs gapped to .9,changed afm,coil-packs,fitted new fmic, adjusted cas back to standard position, coolant temp sensor, hardwired fuel pump.
Anyone had the same problem ?
Thanks in advance