Stalling on deceleration
Hello, I have a 1992 RHD FD. I recently got it running after porting my wastegate, doing a VAC hose job, solenoid job, and injector cleaning. It got running and idled fine and will rev cleanly once and then RPMs drop to 200-300 and then it stalls out. If I bring the throttle down to idle slowly it will stay alive.
I have a PFC, Emissions delete, Double Throttle delete, HKS twin power, Cat back, OMP delete, and a V mount.
I have checked my TPS calibration, Clutch Switch, FPR, MAP sensor, and I sprayed brake cleaner around everything while it was running and I didn’t notice any change in RPMs (I sprayed it in my filters and the idle didn’t change either so I may have to try a different fluid). I don’t think my IAC is faulty because when I switch my A/C on the idle will rise. I don’t have a dashpot and I didn’t have one before the job but my car was running then so I’m ruling that out.
Any help or places to start looking would be greatly appreciated.
I have a PFC, Emissions delete, Double Throttle delete, HKS twin power, Cat back, OMP delete, and a V mount.
I have checked my TPS calibration, Clutch Switch, FPR, MAP sensor, and I sprayed brake cleaner around everything while it was running and I didn’t notice any change in RPMs (I sprayed it in my filters and the idle didn’t change either so I may have to try a different fluid). I don’t think my IAC is faulty because when I switch my A/C on the idle will rise. I don’t have a dashpot and I didn’t have one before the job but my car was running then so I’m ruling that out.
Any help or places to start looking would be greatly appreciated.
Last edited by Jarbor; Feb 4, 2026 at 09:48 PM.
Took off my injectors to see if anything got put back together wrong and didn’t find anything. Got my fuel pump out to see if there was anything odd and it looks good, no burnt connectors or corroded equipment. I’m really stumped as to what could be causing my stalling on decel problem that wasn’t there before my maintenance.
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