i have a 93 fd3s r1
i have a series of running problems, which any help would be much appreciated

first of all when the car is all warmed up, the boost is inconsistant showing only about 6psi until 5500rpm in second gear then it boosts up to 10psi & goes like ****!! this doesnt happen in any other gear (just stays at 6psi)

second of all is when the engine is really hot (so the fans are kicking in) she idles very inconsistant by dropping very low (about 450rpm) back up to about 800rpm, and takes a few seconds to settle herself to 700rpm (sometimes she doesnt)
also when the engine is this hot, the acceleration is very jerky and power delivery is very on-off - almost impossible to drive

please help

i have changed the fuel filter
plugs
tps sensor
airfilters
& checked all my hoses

(could it have anything to do with my secondry throttle?)
(or any of my actuators)

im running out of ideas

its so frustating

 

check all the grounds and all the vaccum lines

 

thanks im going to add more grounds to the car

 

the boost problem was the PCV valve, in which i just bypassed like the later models do

then the running & idle problems were all down to the IAT sensor & i found this out by pluggin an APEXI PFC into it, in the end i bought the PFC for a bargain price of £250 & got her rolling roaded

she now runs like a dream