Hi i have just bought my self a 1990 lexus ls400 but its running really rough really rich throwing code 24 (iat) to my knowlage its part of the maf so i replaced maf and no change but under heavy accelaration its fine after about 3,000rpm but starts jerking at idle. Could a bad coolant temp sensor cause this but im not throwing a code but live dignostics is showing car at -25degrees celcius wtf?? I just picked up 8 new denso plugs for the old girl but it i think the problem lies somewhere else thanks