Hijet 1.3 petrol 1998 power lack.bogging down

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Hello.
New to this and my first post. I am after some guidance please if anyone can help. Ive recently purchased a 2nd Hijet 1.3 petrol 1998 Pick up. It has had various small issues that are now sorted but its still lacking in power when the accelerator is pressed whilst driving along. It is sort of ok if you slowly depress the pedal but if you put your foot down the van stutters and bogs down. I might be wrong but it feels like a fuel issue? It revs up perfectly when its not under load (stationary).

Anyone have any tips for me to try, fuel agent, flushing stuff or remove the injectors etc etc?

Just so you know, its now had a full service with new plugs etc so i dont think its one of those breaking down but i suppose it could also be the leads breaking down?

any help would be much appreciated to possibly save me some time.

Thanks